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Body which defines British electoral constituencies

In the United Kingdom, the boundary commissions are non departmental public bodies responsible for determining the boundaries of parliamentary constituencies for elections to the House of Commons. There are four boundary commissions: one each for England, Scotland, Wales and Northern Ireland. Each commission comprises four members, three of whom take part in meetings. The speaker of the House of Commons chairs each of the boundary commissions ex officio but does not play any part in the review, and a High Court judge is appointed to each boundary commission as deputy chair.

Once a commission has completed its review, it submits a report to the appropriate Secretary of State who lays it before Parliament. Once all four reports have been submitted, an Order in Council which gives effect to the recommendations must be submitted within four months to the Privy Council. The Government may not modify any of the commissions' recommendations unless specifically requested to do so by the relevant commission. On approval by the Privy Council, the new constituencies come into effect for the next general election. Any by elections before then use the pre existing boundaries. These provisions were brought in by the Parliamentary Constituencies Act 2020. Previously, Parliament voted on the recommendations and, although it could not make any alterations to them, it could reject them in their entirety. In addition, although this power was never exercised, for many years the legislation gave the Secretary of State the power to modify a commission's recommendations. The new procedures further strengthen the separation of the creation of constituency boundaries from those elected for the resulting electoral areas, with the aim of eliminating any scope for gerrymandering.

The commissions are currently established under the Parliamentary Constituencies Act 1986, most recently amended by the Parliamentary Voting System and Constituencies Act 2011. They were first established as permanent bodies under the House of Commons (Redistribution of Seats) Act 1944. The 1944 Act was amended in 1947 and then replaced by the House of Commons (Redistribution of Seats) Act 1949. The 1949 Act was amended in 1958 and 1979 and replaced by the Parliamentary Constituencies Act 1986; changes in legislation from 1944 to 1986 were generally incremental in nature. The Political Parties, Elections and Referendums Act 2000 under PM Tony Blair's government envisaged that the functions of the boundary commissioners would be transferred to the United Kingdom Electoral Commission, but this never transpired: the Local Democracy, Economic Development and Construction Act 2009 repealed the Act of Parliament (of 2000) effective from 1 April 2010. The Parliamentary Voting System and Constituencies Act 2011 passed under the Con Lib Dem coalition government made substantial changes to the legislation governing constituency boundary reviews; this was further amended by the Parliamentary Constituencies Act 2020.

The Sixth Periodic Review of Westminster constituencies was launched on 4 March 2011 by the Boundary Commission for England, the Boundary Commission for Scotland, the Boundary Commission for Wales and the Boundary Commission for Northern Ireland. The Sixth Review would have resulted in 600 constituencies for the United Kingdom Parliament: a reduction from the 650 constituencies in existence at the 2010 general election. In January 2013, parliamentary opposition to proposed legislative amendments because of a lack of consensus in the coalition resulted in the review being suspended. Following the Conservative victory at the 2015 general election, the review was recommenced in 2016 and final recommendations were submitted by the four commissions in September 2018 and laid before Parliament. However the revised proposals were never brought forward by the Government for approval and, further to the passing of the Parliamentary Constituencies Act 2020, the Sixth Review was formally abandoned.

Following the passing of the 2020 Act, which reinstated the number of constituencies to 650, a new review, known as the 2023 Review, was launched by the four commissions on 5 January 2021. Under the rules governing the number of constituencies in each nation, England will have 543 constituencies (+10), Wales 32 ( 8), Scotland 57 ( 2) and Northern Ireland 18 (unchanged). The final consultation for England began on 8 November 2022 with the publication of the Revised Proposals and lasted for four weeks, ending on 5 December. All four Commissions submitted their Final Recommendations Reports to the Speaker of the House of Commons on 27 June 2023. An order in council adopting the recommendations, The Parliamentary Constituencies Order 2023 (No. 1230 of 2023), was made on 15 November 2023 and came into force on 29 November 2023.

The procedure for reviews of constituencies and regions for the Scottish Parliament is set down by the Scotland Act 1998. That Act specifies that there are 73 constituencies for the Scottish Parliament: Na h Eileanan an Iar, the Orkney Islands, the Shetland Islands and 70 others. The Act also specifies that the constituencies are grouped into eight regions to allow the return of list members elected by proportional representation to the parliament. The Boundary Commission for Scotland conducted a review of these boundaries between 2007 and 2010, and their recommendations were implemented from 2011. Since the legislation requires different numbers of constituencies in Scotland for the United Kingdom Parliament and the Scottish Parliament, these two sets of areas do not fit together neatly. Responsibility for Scottish Parliament boundary reviews passed to the Local Government Boundary Commission for Scotland in May 2017.

The Government of Wales Act 2006 specified that the constituencies for the then National Assembly for Wales were to be the same as those for the UK Parliament at Westminster. The Act required the Boundary Commission for Wales to group the constituencies into electoral regions, to allow the return of list members elected by proportional representation to the Assembly. The Boundary Commission for Wales's Fifth General Review resulted in revised Assembly constituencies and electoral regions. The Parliamentary Voting System and Constituencies Act 2011 removed the link with Westminster constituencies, and there is currently no statutory review body for Senedd constituencies. The Boundary Commission reported in 2016 proposing to reduce the number of UK Parliament constituencies in Wales to 29, on the basis that all constituencies must have at least 71,031 voters. While the Parliamentary Voting System and Constituencies Act 2011 removed the link between UK Parliament and Senedd seat boundaries, organisations such as the Electoral Reform Society have indicated a preference for coterminosity (meaning the mirroring of seat boundaries in Wales along the lines of the 2016 proposed reforms to the Welsh seats in the UK Parliament).

Section 33 of the Northern Ireland Act 1998 provides that the constituencies for the Northern Ireland Assembly are the same as the constituencies that are used for the United Kingdom Parliament. From 1998 to 2016 six members were elected from each constituency; the Assembly Members (Reduction of Numbers) Act (Northern Ireland) 2016 reduced this to five members.