The United Kingdom is a constitutional monarchy with a parliamentary democracy. The monarch is Queen Elizabeth II, who has reigned since 6 February 1952. The capital of the United Kingdom and its largest city is London, a global city and financial centre with an urban area population of 10.3 million, the fourth-largest in Europe and second-largest in the European Union. Other major urban areas in the United Kingdom include the conurbations centred on Birmingham, Leeds, Glasgow, Liverpool and Manchester. The United Kingdom consists of four countries—England, Scotland, Wales and Northern Ireland. The last three have devolved administrations, each with varying powers, based in their capitals, Edinburgh, Cardiff and Belfast, respectively. The nearby Isle of Man, Bailiwick of Guernsey and Bailiwick of Jersey are not part of the United Kingdom, being Crown dependencies with the British Government responsible for defence and international representation.
The relationships among the countries of the UK have changed over time. Wales was annexed by the Kingdom of England under the Laws in Wales Acts 1535 and 1542. A treaty between England and Scotland resulted in 1707 in a unified Kingdom of Great Britain, which merged in 1801 with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland. Five-sixths of Ireland seceded from the UK in 1922, leaving the present formulation of the United Kingdom of Great Britain and Northern Ireland. There are fourteen British Overseas Territories. These are the remnants of the British Empire which, at its height in the 1920s, encompassed almost a quarter of the world's land mass and was the largest empire in history. British influence can be observed in the language, culture and legal systems of many of its former colonies.
The United Kingdom is a developed country and has the world's fifth-largest economy by nominal GDP and ninth-largest economy by purchasing power parity. The UK is considered to have a high-income economy and is categorised as very high in the Human Development Index, ranking 16th in the world. It was the world's first industrialised country and the world's foremost power during the 19th and early 20th centuries. The UK remains a great power with considerable economic, cultural, military, scientific and political influence internationally. It is a recognised nuclear weapons state and is seventh in military expenditure in the world. The UK has been a permanent member of the United Nations Security Council since its first session in 1946. It has been a leading member state of the EU and its predecessor, the European Economic Community, since 1973. However, on 23 June 2016, a national referendum on the UK's membership of the EU resulted in a decision to leave, and its exit from the EU is currently being negotiated. The UK is also a member of the Commonwealth of Nations, the Council of Europe, the G7 finance ministers, the G7 forum, the G20, NATO, the Organisation for Economic Co-operation and Development, and the World Trade Organization.
The 1707 Acts of Union declared that the kingdoms of England and Scotland were "United into One Kingdom by the Name of Great Britain", though the new state is also referred to in the Acts as the "Kingdom of Great Britain", "United Kingdom of Great Britain" and "United Kingdom". The term "United Kingdom" is found in informal use during the 18th century and the country was also occasionally referred to as the "United Kingdom of Great Britain" though its full official name, from 1707 to 1800, was merely "Great Britain", without a "long form". The Acts of Union 1800 united the Kingdom of Great Britain and the Kingdom of Ireland in 1801, forming the United Kingdom of Great Britain and Ireland. Following the partition of Ireland and the independence of the Irish Free State in 1922, which left Northern Ireland as the only part of the island of Ireland within the United Kingdom, the name "United Kingdom of Great Britain and Northern Ireland" was adopted.
Although the United Kingdom, as a sovereign state, is a country, England, Scotland, Wales and, to a lesser degree, Northern Ireland, are also regarded as countries, though they are not sovereign states. Scotland, Wales and Northern Ireland have devolved self-government. The British Prime Minister's website has used the phrase "countries within a country" to describe the United Kingdom. Some statistical summaries, such as those for the twelve NUTS 1 regions of the United Kingdom, also refer to Scotland, Wales and Northern Ireland as "regions". Northern Ireland is also referred to as a "province". With regard to Northern Ireland, the descriptive name used "can be controversial, with the choice often revealing one's political preferences".
The term "Britain" is often used as synonym for the United Kingdom. The term "Great Britain", by contrast, refers conventionally to the island of Great Britain, or politically to England, Scotland and Wales in combination. However, it is sometimes used as a loose synonym for the United Kingdom as a whole. GB and GBR are the standard country codes for the United Kingdom (see ISO 3166-2 and ISO 3166-1 alpha-3) and are consequently used by international organisations to refer to the United Kingdom. Additionally, the United Kingdom's Olympic team competes under the name "Great Britain" or "Team GB".
The adjective "British" is commonly used to refer to matters relating to the United Kingdom. The term has no definite legal connotation, but is used in law to refer to United Kingdom citizenship and matters to do with nationality. People of the United Kingdom use a number of different terms to describe their national identity and may identify themselves as being British; or as being English, Scottish, Welsh, Northern Irish, or Irish; or as being both.
In 2006, a new design of British passport was introduced. Its first page shows the long form name of the state in English, Welsh and Scottish Gaelic. In Welsh, the long form name of the state is "Teyrnas Unedig Prydain Fawr a Gogledd Iwerddon", with "Teyrnas Unedig" being used as a short form name on government websites. However, it is usually abbreviated to "DU" for the mutated form "Y Deyrnas Unedig". In Scottish Gaelic, the long form is "Rìoghachd Aonaichte Bhreatainn is Èireann a Tuath" and the short form "Rìoghachd Aonaichte".
Settlement by anatomically modern humans of what was to become the United Kingdom occurred in waves beginning by about 30,000 years ago. By the end of the region's prehistoric period, the population is thought to have belonged, in the main, to a culture termed Insular Celtic, comprising Brythonic Britain and Gaelic Ireland. The Roman conquest, beginning in 43 AD, and the 400-year rule of southern Britain, was followed by an invasion by Germanic Anglo-Saxon settlers, reducing the Brythonic area mainly to what was to become Wales, the Brittonic Kingdom incorporating later Brittany, Dumnonia (later becomin English counties Cornwall and Devon) and the historic Kingdom of Strathclyde. Most of the region settled by the Anglo-Saxons became unified as the Kingdom of England in the 10th century. Meanwhile, Gaelic-speakers in north-west Britain (with connections to the north-east of Ireland and traditionally supposed to have migrated from there in the 5th century) united with the Picts to create the Kingdom of Scotland in the 9th century.
In 1066, the Normans and their Breton allies invaded England from northern France and after its conquest, seized large parts of Wales, conquered much of Ireland and were invited to settle in Scotland, bringing to each country feudalism on the Northern French model and Norman-French culture. The Norman elites greatly influenced, but eventually assimilated with, each of the local cultures. Subsequent medieval English kings completed the conquest of Wales and made an unsuccessful attempt to annex Scotland. Following the Declaration of Arbroath, Scotland maintained its independence, albeit in near-constant conflict with England. The English monarchs, through inheritance of substantial territories in France and claims to the French crown, were also heavily involved in conflicts in France, most notably the Hundred Years War, while the Kings of Scots were in an alliance with the French during this period.
The early modern period saw religious conflict resulting from the Reformation and the introduction of Protestant state churches in each country. Wales was fully incorporated into the Kingdom of England, and Ireland was constituted as a kingdom in personal union with the English crown. In what was to become Northern Ireland, the lands of the independent Catholic Gaelic nobility were confiscated and given to Protestant settlers from England and Scotland.
In 1603, the kingdoms of England, Scotland and Ireland were united in a personal union when James VI, King of Scots, inherited the crowns of England and Ireland and moved his court from Edinburgh to London; each country nevertheless remained a separate political entity and retained its separate political, legal, and religious institutions.
In the mid-17th century, all three kingdoms were involved in a series of connected wars (including the English Civil War) which led to the temporary overthrow of the monarchy and the establishment of the short-lived unitary republic of the Commonwealth of England, Scotland and Ireland. During the 17th and 18th centuries, British sailors were involved in acts of piracy (privateering), attacking and stealing from ships off the coast of Europe and the Caribbean.
Although the monarchy was restored, the Interregnum ensured (along with the Glorious Revolution of 1688 and the subsequent Bill of Rights 1689, and the Claim of Right Act 1689) that, unlike much of the rest of Europe, royal absolutism would not prevail, and a professed Catholic could never accede to the throne. The British constitution would develop on the basis of constitutional monarchy and the parliamentary system. With the founding of the Royal Society in 1660, science was greatly encouraged. During this period, particularly in England, the development of naval power (and the interest in voyages of discovery) led to the acquisition and settlement of overseas colonies, particularly in North America.
On 1 May 1707, the united Kingdom of Great Britain came into being, the result of Acts of Union being passed by the parliaments of England and Scotland to ratify the 1706 Treaty of Union and so unite the two kingdoms.
In the 18th century, cabinet government developed under Robert Walpole, in practice the first prime minister (1721–1742). A series of Jacobite Uprisings sought to remove the Protestant House of Hanover from the British throne and restore the Catholic House of Stuart. The Jacobites were finally defeated at the Battle of Culloden in 1746, after which the Scottish Highlanders were brutally suppressed. The British colonies in North America that broke away from Britain in the American War of Independence became the United States of America, recognised by Britain in 1783. British imperial ambition turned elsewhere, particularly to India.
During the 18th century, Britain was involved in the Atlantic slave trade. British ships transported an estimated two million slaves from Africa to the West Indies before banning the trade in 1807, banning slavery in 1833, and taking a leading role in the movement to abolish slavery worldwide by pressing other nations to end their trade with a series of treaties, and then formed the world's oldest international human rights organisation, Anti-Slavery International, in London in 1839. The term "United Kingdom" became official in 1801 when the parliaments of Britain and Ireland each passed an Act of Union, uniting the two kingdoms and creating the United Kingdom of Great Britain and Ireland.
In the early 19th century, the British-led Industrial Revolution began to transform the country. Gradually political power shifted away from the old Tory and Whig landowning classes towards the new industrialists. An alliance of merchants and industrialists with the Whigs would lead to a new party, the Liberals, with an ideology of free trade and laissez-faire. In 1832 Parliament passed the Great Reform Act, which began the transfer of political power from the aristocracy to the middle classes. In the countryside, enclosure of the land was driving small farmers out. Towns and cities began to swell with a new urban working class. Few ordinary workers had the vote, and they created their own organisations in the form of trade unions.
After the defeat of France at the end of the Revolutionary and Napoleonic Wars (1792–1815), Great Britain emerged as the principal naval and imperial power of the 19th century (with London the largest city in the world from about 1830). Unchallenged at sea, British dominance was later described as Pax Britannica ("British Peace"), a period of relative peace in Europe and the world (1815–1914) during which the British Empire became the global hegemon and adopted the role of global policeman. By the time of the Great Exhibition of 1851, Britain was described as the "workshop of the world". The British Empire was expanded to include India, large parts of Africa and many other territories throughout the world. Alongside the formal control it exerted over its own colonies, British dominance of much of world trade meant that it effectively controlled the economies of many regions, such as Asia and Latin America. Domestically, political attitudes favoured free trade and laissez-faire policies and a gradual widening of the voting franchise. During the century, the population increased at a dramatic rate, accompanied by rapid urbanisation, causing significant social and economic stresses. To seek new markets and sources of raw materials, the Conservative Party under Disraeli launched a period of imperialist expansion in Egypt, South Africa, and elsewhere. Canada, Australia, and New Zealand became self-governing dominions. After the turn of the century, Britain's industrial dominance was challenged by the United States and Germany.
Social reform and home rule for Ireland were important domestic issues after 1900. The Labour Party emerged from an alliance of trade unions and small socialist groups in 1900, and suffragettes campaigned for women's right to vote before 1914.
Britain fought alongside France, Russia and (after 1917) the United States, against Germany and its allies in the First World War (1914–1918). British armed forces were engaged across much of the British Empire and in several regions of Europe, particularly on the Western front. The high fatalities of trench warfare caused the loss of much of a generation of men, with lasting social effects in the nation and a great disruption in the social order.
After the war, Britain received the League of Nations mandate over a number of former German and Ottoman colonies. The British Empire reached its greatest extent, covering a fifth of the world's land surface and a quarter of its population. However, Britain had suffered 2.5 million casualties and finished the war with a huge national debt.
The rise of Irish nationalism, and disputes within Ireland over the terms of Irish Home Rule, led eventually to the partition of the island in 1921. The Irish Free State became independent with Dominion status in 1922. Northern Ireland remained part of the United Kingdom. A wave of strikes in the mid-1920s culminated in the General Strike of 1926. Britain had still not recovered from the effects of the war when the Great Depression (1929–1932) occurred. This led to considerable unemployment and hardship in the old industrial areas, as well as political and social unrest in the 1930s, with rising membership in communist and socialist parties. A coalition government was formed in 1931.
Britain entered the Second World War by declaring war on Nazi Germany in 1939, after Germany had invaded Poland. Winston Churchill became prime minister and head of a coalition government in 1940. Despite the defeat of its European allies in the first year of the war, Britain and its Empire continued the fight alone against Germany. In 1940, the Royal Air Force defeated the German Luftwaffe in a struggle for control of the skies in the Battle of Britain. Urban areas suffered heavy bombing during the Blitz. There were also eventual hard-fought victories in the Battle of the Atlantic, the North Africa campaign and the Burma campaign. British forces played an important role in the Normandy landings of 1944, achieved with its United States ally.
After the end of the Second World War in 1945, the UK was one of the Big Four powers (the Soviet Union, the United Kingdom, the US and China) who met to plan the post-war world; it was an original signatory to the Declaration of the United Nations. The UK became one of the five permanent members of the United Nations Security Council. However, the war left the UK severely weakened and depending financially on the Marshall Plan. In the immediate post-war years, the Labour government initiated a radical programme of reforms, which had a significant effect on British society in the following decades. Major industries and public utilities were nationalised, a welfare state was established, and a comprehensive, publicly funded healthcare system, the National Health Service, was created. The rise of nationalism in the colonies coincided with Britain's now much-diminished economic position, so that a policy of decolonisation was unavoidable. Independence was granted to India and Pakistan in 1947. Over the next three decades, most colonies of the British Empire gained their independence. Many became members of the Commonwealth of Nations.
Although the UK was the third country to develop a nuclear weapons arsenal (with its first atomic bomb test in 1952), the new post-war limits of Britain's international role were illustrated by the Suez Crisis of 1956. The international spread of the English language ensured the continuing international influence of its literature and culture. As a result of a shortage of workers in the 1950s, the government encouraged immigration from Commonwealth countries. In the following decades, the UK became a more multi-ethnic society than before. Despite rising living standards in the late 1950s and 60s, the UK's economic performance was less successful than many of its main competitors such as France, West Germany and Japan.
In the decade-long process of European integration, the UK was a founding member of the alliance called the Western European Union, established with the London and Paris Conferences in 1954. In 1960 the UK was one of the seven founding members of the European Free Trade Association (EFTA), but in 1973 it left to join the European Communities (EC). When the EC became the European Union (EU) in 1992, the UK was one of the 12 founding members. The Treaty of Lisbon was signed in 2007, which forms the constitutional basis of the European Union since then.
From the late 1960s, Northern Ireland suffered communal and paramilitary violence (sometimes affecting other parts of the UK) conventionally known as the Troubles. It is usually considered to have ended with the Belfast "Good Friday" Agreement of 1998.
Following a period of widespread economic slowdown and industrial strife in the 1970s, the Conservative government of the 1980s under Margaret Thatcher initiated a radical policy of monetarism, deregulation, particularly of the financial sector (for example, Big Bang in 1986) and labour markets, the sale of state-owned companies (privatisation), and the withdrawal of subsidies to others. This resulted in high unemployment and social unrest, but ultimately also economic growth, particularly in the services sector. From 1984, the economy was helped by the inflow of substantial North Sea oil revenues.
Around the end of the 20th century there were major changes to the governance of the UK with the establishment of devolved administrations for Scotland, Wales and Northern Ireland. The statutory incorporation followed acceptance of the European Convention on Human Rights. The UK is still a key global player diplomatically and militarily. It plays leading roles in the EU, UN and NATO. However, controversy surrounds some of Britain's overseas military deployments, particularly in Afghanistan and Iraq.
The 2008 global financial crisis severely affected the UK economy. The coalition government of 2010 introduced austerity measures intended to tackle the substantial public deficits which resulted. In 2014 the Scottish Government held a referendum on Scottish independence, with 55% of voters rejecting the independence proposal and opting to remain within the United Kingdom. In 2016, the United Kingdom voted to leave the European Union. The legal process of leaving the EU began on 29 March 2017, with the UK's invocation of Article 50 of the Treaty of Lisbon, formally notifying the EU of the UK's intention to leave. The article stipulates that the negotiations to leave will last at least two years. The UK remains a full member of the EU during this time.
The total area of the United Kingdom is approximately 243,610 square kilometres (94,060 sq mi). The country occupies the major part of the British Isles archipelago and includes the island of Great Britain, the north-eastern one-sixth of the island of Ireland and some smaller surrounding islands. It lies between the North Atlantic Ocean and the North Sea with the south-east coast coming within 22 miles (35 km) of the coast of northern France, from which it is separated by the English Channel. In 1993 10% of the UK was forested, 46% used for pastures and 25% cultivated for agriculture. The Royal Greenwich Observatory in London is the defining point of the Prime Meridian.
The United Kingdom lies between latitudes 49° to 61° N, and longitudes 9° W to 2° E. Northern Ireland shares a 224-mile (360 km) land boundary with the Republic of Ireland. The coastline of Great Britain is 11,073 miles (17,820 km) long. It is connected to continental Europe by the Channel Tunnel, which at 31 miles (50 km) (24 miles (38 km) underwater) is the longest underwater tunnel in the world.
England accounts for just over half of the total area of the UK, covering 130,395 square kilometres (50,350 sq mi). Most of the country consists of lowland terrain, with mountainous terrain north-west of the Tees-Exe line; including the Cumbrian Mountains of the Lake District, the Pennines, Exmoor and Dartmoor. The main rivers and estuaries are the Thames, Severn and the Humber. England's highest mountain is Scafell Pike (978 metres (3,209 ft)) in the Lake District. Its principal rivers are the Severn, Thames, Humber, Tees, Tyne, Tweed, Avon, Exe and Mersey.
Scotland accounts for just under a third of the total area of the UK, covering 78,772 square kilometres (30,410 sq mi) and including nearly eight hundred islands, predominantly west and north of the mainland; notably the Hebrides, Orkney Islands and Shetland Islands. Scotland is the most mountainous country in the UK and its topography is distinguished by the Highland Boundary Fault—a geological rock fracture—which traverses Scotland from Arran in the west to Stonehaven in the east. The fault separates two distinctively different regions; namely the Highlands to the north and west and the lowlands to the south and east. The more rugged Highland region contains the majority of Scotland's mountainous land, including Ben Nevis which at 1,343 metres (4,406 ft) is the highest point in the British Isles. Lowland areas—especially the narrow waist of land between the Firth of Clyde and the Firth of Forth known as the Central Belt—are flatter and home to most of the population including Glasgow, Scotland's largest city, and Edinburgh, its capital and political centre, although upland and mountainous terrain lies within the Southern Uplands.
Wales accounts for less than a tenth of the total area of the UK, covering 20,779 square kilometres (8,020 sq mi). Wales is mostly mountainous, though South Wales is less mountainous than North and mid Wales. The main population and industrial areas are in South Wales, consisting of the coastal cities of Cardiff, Swansea and Newport, and the South Wales Valleys to their north. The highest mountains in Wales are in Snowdonia and include Snowdon (Welsh: Yr Wyddfa) which, at 1,085 metres (3,560 ft), is the highest peak in Wales. The 14, or possibly 15, Welsh mountains over 3,000 feet (910 metres) high are known collectively as the Welsh 3000s. Wales has over 2,704 kilometres (1,680 miles) of coastline. Several islands lie off the Welsh mainland, the largest of which is Anglesey (Ynys Môn) in the north-west.
Northern Ireland, separated from Great Britain by the Irish Sea and North Channel, has an area of 14,160 square kilometres (5,470 sq mi) and is mostly hilly. It includes Lough Neagh which, at 388 square kilometres (150 sq mi), is the largest lake in the British Isles by area. The highest peak in Northern Ireland is Slieve Donard in the Mourne Mountains at 852 metres (2,795 ft).
The United Kingdom has a temperate climate, with plentiful rainfall all year round. The temperature varies with the seasons seldom dropping below −11 °C (12 °F) or rising above 35 °C (95 °F). The prevailing wind is from the south-west and bears frequent spells of mild and wet weather from the Atlantic Ocean, although the eastern parts are mostly sheltered from this wind since the majority of the rain falls over the western regions the eastern parts are therefore the driest. Atlantic currents, warmed by the Gulf Stream, bring mild winters; especially in the west where winters are wet and even more so over high ground. Summers are warmest in the south-east of England, being closest to the European mainland, and coolest in the north. Heavy snowfall can occur in winter and early spring on high ground, and occasionally settles to great depth away from the hills.
There is no consistent system of administrative or geographic demarcation across the United Kingdom. Each country of the United Kingdom has its own arrangements, whose origins often pre-date the UK's formation. Until the 19th century there was little change to those arrangements, but there has since been a constant evolution of role and function, most significantly the devolution of powers to Scotland, Wales and Northern Ireland.
The organisation of local government in England is complex, with the distribution of functions varying according to local arrangements. Legislation concerning local government in England is the responsibility of the UK's parliament and the government, as England has no devolved legislature. The upper-tier subdivisions of England are the nine regions, now used primarily for statistical purposes. One region, Greater London, has had a directly elected assembly and mayor since 2000 following popular support for the proposal in a referendum. It was intended that other regions would also be given their own elected regional assemblies, but a proposed assembly in the North East region was rejected by a referendum in 2004. Below the regional tier, some parts of England have county councils and district councils and others have unitary authorities; while London consists of 32 London boroughs and the City of London. Councillors are elected by the first-past-the-post system in single-member wards or by the multi-member plurality system in multi-member wards.
For local government purposes, Scotland is divided into 32 council areas, with wide variation in both size and population. The cities of Glasgow, Edinburgh, Aberdeen and Dundee are separate council areas, as is the Highland Council which includes a third of Scotland's area but only just over 200,000 people. Local councils are made up of elected councillors, of whom there are 1,223; they are paid a part-time salary. Elections are conducted by single transferable vote in multi-member wards that elect either three or four councillors. Each council elects a Provost, or Convenor, to chair meetings of the council and to act as a figurehead for the area. Councillors are subject to a code of conduct enforced by the Standards Commission for Scotland. The representative association of Scotland's local authorities is the Convention of Scottish Local Authorities (COSLA).
Local government in Wales consists of 22 unitary authorities. These include the cities of Cardiff, Swansea and Newport which are unitary authorities in their own right. Elections are held every four years under the first-past-the-post system. The most recent elections were held in May 2012, except for the Isle of Anglesey. The Welsh Local Government Association represents the interests of local authorities in Wales.
Local government in Northern Ireland has since 1973 been organised into 26 district councils, each elected by single transferable vote. Their powers are limited to services such as collecting waste, controlling dogs and maintaining parks and cemeteries. On 13 March 2008 the executive agreed on proposals to create 11 new councils and replace the present system. The next local elections were postponed until 2016 to facilitate this.
The United Kingdom has sovereignty over seventeen territories which do not form part of the United Kingdom itself: fourteen British Overseas Territories and three Crown dependencies.
The fourteen British Overseas Territories are: Anguilla; Bermuda; the British Antarctic Territory; the British Indian Ocean Territory; the British Virgin Islands; the Cayman Islands; the Falkland Islands; Gibraltar; Montserrat; Saint Helena, Ascension and Tristan da Cunha; the Turks and Caicos Islands; the Pitcairn Islands; South Georgia and the South Sandwich Islands; and Akrotiri and Dhekelia on the island of Cyprus. British claims in Antarctica are not universally recognised. Collectively Britain's overseas territories encompass an approximate land area of 1,727,570 square kilometres (667,018 sq mi) and a population of approximately 260,000 people.
They are the last remaining remnants of the British Empire and a 1999 UK government white paper stated that: "[The] Overseas Territories are British for as long as they wish to remain British. Britain has willingly granted independence where it has been requested; and we will continue to do so where this is an option." Self-determination is also enshrined into the constitutions of several overseas territories and three have specifically voted to remain under British sovereignty (Bermuda in 1995, Gibraltar in 2002 and the Falkland Islands in 2013).
The Crown dependencies are possessions of the Crown, as opposed to overseas territories of the UK. They comprise three independently administered jurisdictions: the Channel Islands of Jersey and Guernsey in the English Channel, and the Isle of Man in the Irish Sea. By mutual agreement, the British Government manages the islands' foreign affairs and defence and the UK Parliament has the authority to legislate on their behalf. However, internationally, they are regarded as "territories for which the United Kingdom is responsible". The power to pass legislation affecting the islands ultimately rests with their own respective legislative assemblies, with the assent of the Crown (Privy Council or, in the case of the Isle of Man, in certain circumstances the Lieutenant-Governor). Since 2005 each Crown dependency has had a Chief Minister as its head of government.
The British dependencies use a varied assortment of currencies. These include the British pound, US dollar, New Zealand dollar, euro or their own currencies, which may be pegged to either.
The United Kingdom is a unitary state under a constitutional monarchy. Queen Elizabeth II is the monarch and head of state of the UK, as well as Queen of fifteen other independent Commonwealth countries. The monarch has "the right to be consulted, the right to encourage, and the right to warn". The Constitution of the United Kingdom is uncodified and consists mostly of a collection of disparate written sources, including statutes, judge-made case law and international treaties, together with constitutional conventions. As there is no technical difference between ordinary statutes and "constitutional law", the UK Parliament can perform "constitutional reform" simply by passing Acts of Parliament, and thus has the political power to change or abolish almost any written or unwritten element of the constitution. However, no Parliament can pass laws that future Parliaments cannot change.
The UK has a parliamentary government based on the Westminster system that has been emulated around the world: a legacy of the British Empire. The parliament of the United Kingdom meets in the Palace of Westminster and has two houses: an elected House of Commons and an appointed House of Lords. All bills passed are given Royal Assent before becoming law.
The position of prime minister, the UK's head of government, belongs to the person most likely to command the confidence of the House of Commons; this individual is typically the leader of the political party or coalition of parties that holds the largest number of seats in that chamber. The prime minister chooses a cabinet and its members are formally appointed by the monarch to form Her Majesty's Government. By convention, the monarch respects the prime minister's decisions of government.
The cabinet is traditionally drawn from members of the prime minister's party or coalition and mostly from the House of Commons but always from both legislative houses, the cabinet being responsible to both. Executive power is exercised by the prime minister and cabinet, all of whom are sworn into the Privy Council of the United Kingdom, and become Ministers of the Crown. The current Prime Minister is Theresa May, who has been in office since 13 July 2016. May is also the leader of the Conservative Party. For elections to the House of Commons, the UK is divided into 650 constituencies, each electing a single member of parliament (MP) by simple plurality. General elections are called by the monarch when the prime minister so advises. Prior to the Fixed-term Parliaments Act 2011, the Parliament Acts 1911 and 1949 required that a new election must be called no later than five years after the previous general election.
The Conservative Party, the Labour Party and the Liberal Democrats (formerly as the Liberal Party) have, in modern times, been considered the UK's three major political parties, representing the British traditions of conservatism, socialism and liberalism, respectively. However, in both the 2015 and 2017 general elections, the Scottish National Party was the third-largest party by number of seats won, ahead of the Liberal Democrats. Most of the remaining seats were won by parties that contest elections only in one part of the UK: Plaid Cymru (Wales only); and the Democratic Unionist Party and Sinn Féin (Northern Ireland only). In accordance with party policy, no elected Sinn Féin members of parliament have ever attended the House of Commons to speak on behalf of their constituents because of the requirement to take an oath of allegiance to the monarch.
Scotland, Wales and Northern Ireland each have their own government or executive, led by a First Minister (or, in the case of Northern Ireland, a diarchal First Minister and deputy First Minister), and a devolved unicameral legislature. England, the largest country of the United Kingdom, has no such devolved executive or legislature and is administered and legislated for directly by the UK's government and parliament on all issues. This situation has given rise to the so-called West Lothian question which concerns the fact that members of parliament from Scotland, Wales and Northern Ireland can vote, sometimes decisively, on matters that only affect England. The McKay Commission reported on this matter in March 2013 recommending that laws affecting only England should need support from a majority of English members of parliament.
The Scottish Government and Parliament have wide-ranging powers over any matter that has not been specifically reserved to the UK Parliament, including education, healthcare, Scots law and local government. At the 2011 elections the Scottish National Party won re-election and achieved an overall majority in the Scottish Parliament, with its leader, Alex Salmond, as First Minister of Scotland. In 2012, the UK and Scottish governments signed the Edinburgh Agreement setting out the terms for a referendum on Scottish independence in 2014, which was defeated 55.3% to 44.7%.
The Welsh Government and the National Assembly for Wales have more limited powers than those devolved to Scotland. The Assembly is able to legislate on devolved matters through Acts of the Assembly, which require no prior consent from Westminster. The 2011 elections resulted in a minority Labour administration led by Carwyn Jones.
The Northern Ireland Executive and Assembly have powers similar to those devolved to Scotland. The Executive is led by a diarchy representing unionist and nationalist members of the Assembly. Arlene Foster (Democratic Unionist Party) and Martin McGuinness (Sinn Féin) were First Minister and deputy First Minister respectively until 2017. Devolution to Northern Ireland is contingent on participation by the Northern Ireland administration in the North-South Ministerial Council, where the Northern Ireland Executive cooperates and develops joint and shared policies with the Government of Ireland. The British and Irish governments co-operate on non-devolved matters affecting Northern Ireland through the British–Irish Intergovernmental Conference, which assumes the responsibilities of the Northern Ireland administration in the event of its non-operation.
The UK does not have a codified constitution and constitutional matters are not among the powers devolved to Scotland, Wales or Northern Ireland. Under the doctrine of parliamentary sovereignty, the UK Parliament could, in theory, therefore, abolish the Scottish Parliament, Welsh Assembly or Northern Ireland Assembly. Indeed, in 1972, the UK Parliament unilaterally prorogued the Parliament of Northern Ireland, setting a precedent relevant to contemporary devolved institutions. In practice, it would be politically difficult for the UK Parliament to abolish devolution to the Scottish Parliament and the Welsh Assembly, given the political entrenchment created by referendum decisions. The political constraints placed upon the UK Parliament's power to interfere with devolution in Northern Ireland are even greater than in relation to Scotland and Wales, given that devolution in Northern Ireland rests upon an international agreement with the Government of Ireland.
The United Kingdom does not have a single legal system as Article 19 of the 1706 Treaty of Union provided for the continuation of Scotland's separate legal system. Today the UK has three distinct systems of law: English law, Northern Ireland law and Scots law. A new Supreme Court of the United Kingdom came into being in October 2009 to replace the Appellate Committee of the House of Lords. The Judicial Committee of the Privy Council, including the same members as the Supreme Court, is the highest court of appeal for several independent Commonwealth countries, the British Overseas Territories and the Crown Dependencies.
Both English law, which applies in England and Wales, and Northern Ireland law are based on common-law principles. The essence of common law is that, subject to statute, the law is developed by judges in courts, applying statute, precedent and common sense to the facts before them to give explanatory judgements of the relevant legal principles, which are reported and binding in future similar cases (stare decisis). The courts of England and Wales are headed by the Senior Courts of England and Wales, consisting of the Court of Appeal, the High Court of Justice (for civil cases) and the Crown Court (for criminal cases). The Supreme Court is the highest court in the land for both criminal and civil appeal cases in England, Wales and Northern Ireland and any decision it makes is binding on every other court in the same jurisdiction, often having a persuasive effect in other jurisdictions.
Scots law is a hybrid system based on both common-law and civil-law principles. The chief courts are the Court of Session, for civil cases, and the High Court of Justiciary, for criminal cases. The Supreme Court of the United Kingdom serves as the highest court of appeal for civil cases under Scots law. Sheriff courts deal with most civil and criminal cases including conducting criminal trials with a jury, known as sheriff solemn court, or with a sheriff and no jury, known as sheriff summary Court. The Scots legal system is unique in having three possible verdicts for a criminal trial: "guilty", "not guilty" and "not proven". Both "not guilty" and "not proven" result in an acquittal.
Crime in England and Wales increased in the period between 1981 and 1995, though since that peak there has been an overall fall of 66% in recorded crime from 1995 to 2015, according to crime statistics. The prison population of England and Wales has increased to 86,000, giving England and Wales the highest rate of incarceration in Western Europe at 148 per 100,000. Her Majesty's Prison Service, which reports to the Ministry of Justice, manages most of the prisons within England and Wales. The murder rate in England and Wales has stabilised in the first half of the 2010s with a murder rate around 1 per 100,000 which is half the peak in 2002 and similar to the rate in the 1980s. More sexual offences have been reported to the police since 2002. Crime in Scotland fell slightly in 2014/2015 to its lowest level in 39 years in with 59 killings for a murder rate of 1.1 per 100,000. Scotland's prisons are overcrowded but the prison population is shrinking.
The UK is a permanent member of the United Nations Security Council, a member of NATO, the Commonwealth of Nations, the G7 finance ministers, the G7 forum (previously the G8 forum), the G20, the OECD, the WTO, the Council of Europe, the OSCE. It is also a member state of the European Union in the process of withdrawal. The UK is said to have a "Special Relationship" with the United States and a close partnership with France—the "Entente cordiale"—and shares nuclear weapons technology with both countries. The UK is also closely linked with the Republic of Ireland; the two countries share a Common Travel Area and co-operate through the British-Irish Intergovernmental Conference and the British-Irish Council. Britain's global presence and influence is further amplified through its trading relations, foreign investments, official development assistance and military engagements.
The armed forces of the United Kingdom—officially, Her Majesty's Armed Forces—consist of three professional service branches: the Royal Navy and Royal Marines (forming the Naval Service), the British Army and the Royal Air Force. The forces are managed by the Ministry of Defence and controlled by the Defence Council, chaired by the Secretary of State for Defence. The Commander-in-Chief is the British monarch, Elizabeth II, to whom members of the forces swear an oath of allegiance. The Armed Forces are charged with protecting the UK and its overseas territories, promoting the UK's global security interests and supporting international peacekeeping efforts. They are active and regular participants in NATO, including the Allied Rapid Reaction Corps, as well as the Five Power Defence Arrangements, RIMPAC and other worldwide coalition operations. Overseas garrisons and facilities are maintained in Ascension Island, Belize, Brunei, Canada, Cyprus, Diego Garcia, the Falkland Islands, Germany, Gibraltar, Kenya, Qatar and Singapore.
The British armed forces played a key role in establishing the British Empire as the dominant world power in the 18th, 19th and early 20th centuries. Throughout its unique history the British forces have seen action in a number of major wars, such as the Seven Years' War, the Napoleonic Wars, the Crimean War, the First World War and the Second World War—as well as many colonial conflicts. By emerging victorious from such conflicts, Britain has often been able to decisively influence world events. Since the end of the British Empire, the UK has nonetheless remained a major military power. Following the end of the Cold War, defence policy has a stated assumption that "the most demanding operations" will be undertaken as part of a coalition. Setting aside the intervention in Sierra Leone, recent UK military operations in Bosnia, Kosovo, Afghanistan, Iraq and, most recently, Libya, have followed this approach. The last occasion on which the British military fought alone was the Falklands War of 1982.
According to various sources, including the Stockholm International Peace Research Institute and the International Institute for Strategic Studies, the United Kingdom has the fourth- or fifth-highest military expenditure in the world. Total defence spending amounts to 2.0% of national GDP.
The UK has a partially regulated market economy. Based on market exchange rates, the UK is today the fifth-largest economy in the world and the second-largest in Europe after Germany. HM Treasury, led by the Chancellor of the Exchequer, is responsible for developing and executing the government's public finance policy and economic policy. The Bank of England is the UK's central bank and is responsible for issuing notes and coins in the nation's currency, the pound sterling. Banks in Scotland and Northern Ireland retain the right to issue their own notes, subject to retaining enough Bank of England notes in reserve to cover their issue. The pound sterling is the world's third-largest reserve currency (after the US dollar and the euro). Since 1997 the Bank of England's Monetary Policy Committee, headed by the Governor of the Bank of England, has been responsible for setting interest rates at the level necessary to achieve the overall inflation target for the economy that is set by the Chancellor each year.
The UK service sector makes up around 73% of GDP. London is one of the three "command centres" of the global economy (alongside New York City and Tokyo), it is the world's largest financial centre alongside New York, and it has the largest city GDP in Europe. Edinburgh is also one of the largest financial centres in Europe. Tourism is very important to the British economy; with over 27 million tourists arriving in 2004, the United Kingdom is ranked as the sixth major tourist destination in the world and London has the most international visitors of any city in the world. The creative industries accounted for 7% GVA in 2005 and grew at an average of 6% per annum between 1997 and 2005.
The Industrial Revolution started in the UK with an initial concentration on the textile industry, followed by other heavy industries such as shipbuilding, coal mining and steelmaking. British merchants, shippers and bankers developed overwhelming advantage over those of other nations allowing the UK to dominate international trade in the 19th century. As other nations industrialised, coupled with economic decline after two world wars, the United Kingdom began to lose its competitive advantage and heavy industry declined, by degrees, throughout the 20th century. Manufacturing remains a significant part of the economy but accounted for only 16.7% of national output in 2003.
The automotive industry is a significant part of the UK manufacturing sector and employs around 800,000 people, with a turnover in 2015 of some £70 billion, generating £34.6 billion of exports (11.8% of the UK's total export goods). In 2015, the UK produced around 1.6 million passenger vehicles and 94,500 commercial vehicles. The UK is a major centre for engine manufacturing and in 2015 around 2.4 million engines were produced in the country. The UK has a significant presence in motor racing and the UK motorsport industry employs around 41,000 people, comprises around 4,500 companies and has an annual turnover of around £6 billion.
The aerospace industry of the UK is the second- or third-largest national aerospace industry in the world depending upon the method of measurement and has an annual turnover of around £30 billion. In 2016, the global market opportunity for UK aerospace manufacturers over the next two decades was estimated to be £3.5 trillion. The wings for the Airbus A380 and the A350 XWB are designed and manufactured at Airbus UK's world-leading Broughton facility, whilst over a quarter of the value of the Boeing 787 comes from UK manufacturers including Eaton (fuel subsystem pumps), Messier-Bugatti-Dowty (the landing gear) and Rolls-Royce (the engines). Other key names include GKN Aerospace—an expert in metallic and composite aerostructures that's involved in almost every civil and military fixed and rotary wing aircraft in production and development today.
BAE Systems plays a critical role in some of the world's biggest defence aerospace projects. The company makes large sections of the Typhoon Eurofighter at its sub-assembly plant in Samlesbury and assembles the aircraft for the Royal Air Force at its Warton Plant, near Preston. It is also a principal subcontractor on the F35 Joint Strike Fighter—the world's largest single defence project—for which it designs and manufactures a range of components including the aft fuselage, vertical and horizontal tail and wing tips and fuel system. As well as this it manufactures the Hawk, the world's most successful jet training aircraft. Airbus UK also manufactures the wings for the A400 m military transporter. Rolls-Royce, is the world's second-largest aero-engine manufacturer. Its engines power more than 30 types of commercial aircraft and it has more than 30,000 engines in service in the civil and defence sectors. Rolls-Royce is forecast to have more than 50% of the widebody market share by 2016, ahead of General Electric. Agusta Westland designs and manufactures complete helicopters in the UK.
The UK space industry was worth £9.1bn in 2011 and employed 29,000 people. It is growing at a rate of 7.5% annually, according to its umbrella organisation, the UK Space Agency. Government strategy is for the space industry to be a £40bn business for the UK by 2030, capturing a 10% share of the $250bn world market for commercial space technology. On 16 July 2013, the British Government pledged £60 m to the Skylon project: this investment will provide support at a "crucial stage" to allow a full-scale prototype of the SABRE engine to be built. On 2 November 2015, BAE Systems announced they have bought a 20% stake in Reaction Engines ltd. The working partnership will draw on BAE Systems' extensive aerospace technology development and project management expertise and will provide Reaction Engines with access to critical industrial, technical and capital resources to help progress the development of the SABRE engine.
The pharmaceutical industry plays an important role in the UK economy and the country has the third-highest share of global pharmaceutical R&D expenditures (after the United States and Japan).
Agriculture is intensive, highly mechanised and efficient by European standards, producing about 60% of food needs with less than 1.6% of the labour force (535,000 workers). Around two-thirds of production is devoted to livestock, one-third to arable crops. Farmers are subsidised by the EU's Common Agricultural Policy. The UK retains a significant, though much reduced fishing industry. It is also rich in a number of natural resources including coal, petroleum, natural gas, tin, limestone, iron ore, salt, clay, chalk, gypsum, lead, silica and an abundance of arable land.
In the final quarter of 2008, as a result of the Great Recession, the UK economy officially entered recession for the first time since 1991. Unemployment increased from 5.2% in May 2008 to 7.6% in May 2009 and by January 2012 the unemployment rate among 18- to 24-year-olds had risen from 11.9% to 22.5%, the highest since current records began in 1992, although it had fallen to 14.2% by November 2015. Total UK government debt rose quickly from 44.4% of GDP in 2007 to 82.9% of GDP in 2011, then increased more slowly to 87.5% of GDP in 2015. Following the likes of the United States, France and many major economies, in February 2013, the UK lost its top AAA credit rating for the first time since 1978 with Moodys and Fitch credit agency while, unlike the other major economies retained their triple A rating with the largest agency Standard & Poor's. However, by the end of 2014, UK growth was the fastest in both the G7 and in Europe, and by September 2015, the unemployment rate was down to a seven-year low of 5.3%.
As a direct result of the Great Recession between 2010 and the third quarter of 2012 wages in the UK fell by 3.2%, but by 2015 real wages were growing by 3%, having grown faster than inflation since 2014. Since the 1980s, UK economic inequality, like Canada, Australia and the United States has grown faster than in other developed countries.
The poverty line in the UK is commonly defined as being 60% of the median household income. In 2007–2008 13.5 million people, or 22% of the population, lived below this line. This is a higher level of relative poverty than all but four other EU members. In the same year 4.0 million children, 31% of the total, lived in households below the poverty line after housing costs were taken into account. This is a decrease of 400,000 children since 1998–1999. The UK imports 40% of its food supplies. The Office for National Statistics has estimated that in 2011, 14 million people were at risk of poverty or social exclusion, and that one person in 20 (5.1%) was now experiencing "severe material depression", up from 3 million people in 1977.
The UK has an external debt of $9.6 trillion dollars which is second highest in the world after the US which has an external debt of 18.5 trillion dollars. As a percentage of GDP, external debt is 408% which is third highest in the world after Luxembourg and Iceland.
The combination of the UK's relatively lax regulatory regime and London's financial institutions providing sophisticated methods to launder proceeds from criminal activity around the world, including those from drug trade, makes the City of London a global hub for illicit finance and the UK a safe haven for the world's major-league tax dodgers, according to research papers and reports published in the mid-2010s. The reports on the Panama papers published in April 2016 singled out the UK as being "at the heart of super-rich tax-avoidance network."
England and Scotland were leading centres of the Scientific Revolution from the 17th century and the United Kingdom led the Industrial Revolution from the 18th century, and has continued to produce scientists and engineers credited with important advances. Major theorists from the 17th and 18th centuries include Isaac Newton, whose laws of motion and illumination of gravity have been seen as a keystone of modern science; from the 19th century Charles Darwin, whose theory of evolution by natural selection was fundamental to the development of modern biology, and James Clerk Maxwell, who formulated classical electromagnetic theory; and more recently Stephen Hawking, who has advanced major theories in the fields of cosmology, quantum gravity and the investigation of black holes.
Major scientific discoveries from the 18th century include hydrogen by Henry Cavendish; from the 20th century penicillin by Alexander Fleming, and the structure of DNA, by Francis Crick and others. Famous British engineers and inventors of the Industrial Revolution include James Watt, George Stephenson, Richard Arkwright, Robert Stephenson and Isambard Kingdom Brunel. Other major engineering projects and applications by people from the UK include the steam locomotive, developed by Richard Trevithick and Andrew Vivian; from the 19th century the electric motor by Michael Faraday, the incandescent light bulb by Joseph Swan, and the first practical telephone, patented by Alexander Graham Bell; and in the 20th century the world's first working television system by John Logie Baird and others, the jet engine by Frank Whittle, the basis of the modern computer by Alan Turing, and the World Wide Web by Tim Berners-Lee.
Scientific research and development remains important in British universities, with many establishing science parks to facilitate production and co-operation with industry. Between 2004 and 2008 the UK produced 7% of the world's scientific research papers and had an 8% share of scientific citations, the third and second highest in the world (after the United States and China, respectively). Scientific journals produced in the UK include Nature, the British Medical Journal and The Lancet.
A radial road network totals 29,145 miles (46,904 km) of main roads, 2,173 miles (3,497 km) of motorways and 213,750 miles (344,000 km) of paved roads. The M25, encircling London, is the largest and busiest bypass in the world. In 2009 there were a total of 34 million licensed vehicles in Great Britain.
The UK has a railway network of 10,072 miles (16,209 km) in Great Britain and 189 miles (304 km) in Northern Ireland. Railways in Northern Ireland are operated by NI Railways, a subsidiary of state-owned Translink. In Great Britain, the British Rail network was privatised between 1994 and 1997, which was followed by a rapid rise in passenger numbers following years of decline, although the factors behind this are disputed. Network Rail owns and manages most of the fixed assets (tracks, signals etc.). About 20 privately owned Train Operating Companies operate passenger trains, which carried 1.68 billion passengers in 2015. There are also some 1,000 freight trains in daily operation. The British Government is to spend £30 billion on a new high-speed railway line, HS2, to be operational by 2026. Crossrail, under construction in London, is Europe's largest construction project with a £15 billion projected cost.
In the year from October 2009 to September 2010 UK airports handled a total of 211.4 million passengers. In that period the three largest airports were London Heathrow Airport (65.6 million passengers), Gatwick Airport (31.5 million passengers) and London Stansted Airport (18.9 million passengers). London Heathrow Airport, located 15 miles (24 km) west of the capital, has the most international passenger traffic of any airport in the world and is the hub for the UK flag carrier British Airways, as well as Virgin Atlantic.
In 2006, the UK was the world's ninth-largest consumer of energy and the 15th-largest producer. The UK is home to a number of large energy companies, including two of the six oil and gas "supermajors"—BP and Royal Dutch Shell—and BG Group. In 2011, 40% of the UK's electricity was produced by gas, 30% by coal, 19% by nuclear power and 4.2% by wind, hydro, biofuels and wastes.
In 2013, the UK produced 914 thousand barrels per day (bbl/d) of oil and consumed 1,507 thousand bbl/d. Production is now in decline and the UK has been a net importer of oil since 2005. In 2010 the UK had around 3.1 billion barrels of proven crude oil reserves, the largest of any EU member state. In 2009, 66.5% of the UK's oil supply was imported.
In 2009, the UK was the 13th-largest producer of natural gas in the world and the largest producer in the EU. Production is now in decline and the UK has been a net importer of natural gas since 2004. In 2009, half of British gas was supplied from imports as domestic reserves are depleted.
Coal production played a key role in the UK economy in the 19th and 20th centuries. In the mid-1970s, 130 million tonnes of coal was being produced annually, not falling below 100 million tonnes until the early 1980s. During the 1980s and 1990s the industry was scaled back considerably. In 2011, the UK produced 18.3 million tonnes of coal. In 2005 it had proven recoverable coal reserves of 171 million tons. The UK Coal Authority has stated there is a potential to produce between 7 billion tonnes and 16 billion tonnes of coal through underground coal gasification (UCG) or 'fracking', and that, based on current UK coal consumption, such reserves could last between 200 and 400 years. However, environmental and social concerns have been raised over chemicals getting into the water table and minor earthquakes damaging homes.
In the late 1990s, nuclear power plants contributed around 25% of total annual electricity generation in the UK, but this has gradually declined as old plants have been shut down and ageing-related problems affect plant availability. In 2012, the UK had 16 reactors normally generating about 19% of its electricity. All but one of the reactors will be retired by 2023. Unlike Germany and Japan, the UK intends to build a new generation of nuclear plants from about 2018.
The total of all renewable electricity sources provided for 14.9% of the electricity generated in the United Kingdom in 2013, reaching 53.7 TWh of electricity generated. The UK is one of the best sites in Europe for wind energy, and wind power production is its fastest growing supply, in 2014 it generated 9.3% of the UK's total electricity.
Access to improved water supply and sanitation in the UK is universal. It is estimated that 96.7% of households are connected to the sewer network. According to the Environment Agency, total water abstraction for public water supply in the UK was 16,406 megalitres per day in 2007. In England and Wales the economic regulator of water companies is the Water Services Regulation Authority (Ofwat). The Environment Agency is responsible for environmental regulation, and the Drinking Water Inspectorate for regulating drinking water quality. The economic water industry regulator in Scotland is the Water Industry Commission for Scotland and the environmental regulator is the Scottish Environment Protection Agency. Drinking water standards and wastewater discharge standards in the UK, as in other countries of the European Union, are determined by the EU (see Water supply and sanitation in the European Union).
In England and Wales water and sewerage services are provided by 10 private regional water and sewerage companies and 13 mostly smaller private "water only" companies. In Scotland water and sewerage services are provided by a single public company, Scottish Water. In Northern Ireland water and sewerage services are also provided by a single public entity, Northern Ireland Water.
A census is taken simultaneously in all parts of the UK every ten years. The Office for National Statistics is responsible for collecting data for England and Wales, the General Register Office for Scotland and the Northern Ireland Statistics and Research Agency each being responsible for censuses in their respective countries. In the 2011 census the total population of the United Kingdom was 63,181,775. It is the third-largest in the European Union, the fifth-largest in the Commonwealth and the 22nd-largest in the world. In mid-2014 and mid-2015 net long-term international migration contributed more to population growth. In mid-2012 and mid-2013 natural change contributed the most to population growth. Between 2001 and 2011 the population increased by an average annual rate of approximately 0.7%. This compares to 0.3% per year in the period 1991 to 2001 and 0.2% in the decade 1981 to 1991. The 2011 census also confirmed that the proportion of the population aged 0–14 has nearly halved (31% in 1911 compared to 18 in 2011) and the proportion of older people aged 65 and over has more than tripled (from 5 to 16%). It has been estimated that the number of people aged 100 or over will rise steeply to reach over 626,000 by 2080.
England's population in 2011 was found to be 53 million. It is one of the most densely populated countries in the world, with 420 people resident per square kilometre in mid-2015. with a particular concentration in London and the south-east. The 2011 census put Scotland's population at 5.3 million, Wales at 3.06 million and Northern Ireland at 1.81 million. In percentage terms England has had the fastest growing population of any country of the UK in the period from 2001 to 2011, with an increase of 7.9%.
In 2012 the average total fertility rate (TFR) across the UK was 1.92 children per woman. While a rising birth rate is contributing to current population growth, it remains considerably below the 'baby boom' peak of 2.95 children per woman in 1964, below the replacement rate of 2.1, but higher than the 2001 record low of 1.63. In 2012, Scotland had the lowest TFR at only 1.67, followed by Wales at 1.88, England at 1.94, and Northern Ireland at 2.03. In 2011, 47.3% of births in the UK were to unmarried women. The Office for National Statistics published an "Experimental Official Statistics" bulletin in 2015 showing that, out of the UK population aged 16 and over, 1.7% identify as lesbian, gay, or bisexual (2.0% of males and 1.5% of females). 4.5% of respondents responded with "other", "I don't know", or did not respond.