Politics of the United Kingdom

The United Kingdom is a constitutional monarchy and a unitary parliamentary democracy. A hereditary monarch, King Charles III, is head of state, while the prime minister, Andy Burnham, leads the elected government. Executive power rests with His Majesty’s Government, and the king formally appoints the prime minister, who must be an MP able to command the confidence of the House of Commons—usually the leader of the largest party, though the monarch could appoint someone else if no one can secure that confidence. The prime minister then selects other ministers from Parliament.

Parliament has two chambers: the House of Commons and the House of Lords. Together with the monarch, it forms the supreme legislative body, with unlimited lawmaking powers limited only by convention. Most bills become law after passing both houses and receiving Royal Assent. However, the Parliament Acts allow the Commons to bypass the Lords if it repeatedly rejects a bill, though using this procedure could spark a constitutional crisis.

Some legislative powers have been devolved to the parliaments of Scotland and Wales and the assembly of Northern Ireland. Other limited powers are granted by statute to the Privy Council, ministers, or other bodies to make delegated legislation on specific matters.

The UK has a multi-party system, ranked 22nd most electorally democratic globally by the V-Dem Democracy Indices in 2023. Since the 1920s, the Conservative and Labour parties have dominated. Before Labour’s rise, the Liberal Party was the main alternative to the Conservatives. Coalition and minority governments occur occasionally, but the first-past-the-post voting system tends to entrench the two main parties, though each has sometimes relied on a third party—like the Liberal Democrats—to form a working majority. A Conservative–Liberal Democrat coalition governed from 2010 to 2015, the first since 1945, ending when the Conservatives won 330 of 650 Commons seats in the 7 May 2015 election, while the Liberal Democrats lost all but eight seats.

After the partition of Ireland, Northern Ireland gained home rule in 1920, but civil unrest led to direct rule being restored in 1972. Support for nationalist parties in Scotland and Wales prompted devolution proposals in the 1970s, but it was only implemented in the 1990s. Today, Scotland, Wales, and Northern Ireland each have their own parliament or assembly and government, with Northern Ireland’s devolution tied to participation in all-Ireland institutions. The British government handles non-devolved matters and, for Northern Ireland, cooperates with the Republic of Ireland. Devolution may have boosted support for independence in some parts. The Scottish National Party, the main pro-independence party in Scotland, became a minority government in 2007 and won an overall majority in the 2011 Scottish Parliament elections, forming the current Scottish Government. In the 2014 independence referendum, 44.7% voted for independence and 55.3% against. In Northern Ireland, Irish nationalist parties like Sinn Féin advocate reunification; in Wales, Plaid Cymru supports Welsh independence.

The UK’s constitution is uncodified, composed of conventions, statutes, and other elements. This Westminster system has been adopted by many former British Empire countries.

The UK is also responsible for Crown Dependencies (nearby but subject to the monarch, not part of the UK) and British Overseas Territories (formerly colonies, re-designated in 1983, which are sovereign UK territory). Local governments in these territories handle some internal affairs, each with its own first minister (though titles vary, such as Gibraltar’s Chief Minister). They remain under the authority of the UK Parliament, which governs Great Britain and Northern Ireland directly, not through local subsidiary governments.

The Acts of Union 1707 merged the English and Scottish parliaments into the Kingdom of Great Britain, following the Treaty of Union agreed on 22 July 1706. The Acts of Union 1800 joined Great Britain and Ireland to form the United Kingdom of Great Britain and Ireland. The Government of Ireland Act 1920 partitioned Ireland; the southern part became the Republic of Ireland.