2015 United Kingdom general election in the context of "2016 United Kingdom European Union membership referendum"

Theresa Mary May, Baroness May of Maidenhead (/təˈriːzə/; née Brasier; born 1 October 1956), is a British politician who served as Prime Minister of the United Kingdom and Leader of the Conservative Party from 2016 to 2019. She previously served as Home Secretary from 2010 to 2016. She was Member of Parliament (MP) for Maidenhead from 1997 to 2024, and has been a member of the House of Lords since August 2024. May was the second female British prime minister, after Margaret Thatcher, and the first woman to have held two of the Great Offices of State. May is a one-nation conservative.

May grew up in Oxfordshire and attended St Hugh's College, Oxford. After graduating in 1977, she worked at the Bank of England and the Association for Payment Clearing Services. She also served as a councillor on Merton London Borough Council. After two unsuccessful attempts to be elected to the House of Commons, she was elected MP for Maidenhead at the 1997 general election. From 1999 to 2010, May held several roles in shadow cabinets and was Chairman of the Conservative Party from 2002 to 2003. Following the formation of the coalition government after the 2010 general election, May was appointed home secretary and minister for women and equalities, giving up the latter role in 2012. Reappointed after the Conservatives won the 2015 general election, she became the longest-serving home secretary in more than 60 years. During her tenure as home secretary, she pursued reform of the Police Federation, implemented a harder line on drugs policy and further restricted immigration. She oversaw the introduction of elected police and crime commissioners, the deportation of Abu Qatada and the creation of the College of Policing and the National Crime Agency. Although she supported the Remain campaign, May supported Brexit following the outcome of the 2016 referendum. She was elected and appointed prime minister unopposed, succeeding David Cameron.

Alexander Boris de Pfeffel Johnson (born 19 June 1964) is a British politician and writer who served as Prime Minister of the United Kingdom and Leader of the Conservative Party from 2019 to 2022. He was previously Foreign Secretary from 2016 to 2018 and the second mayor of London from 2008 to 2016. He was Member of Parliament (MP) for Henley from 2001 to 2008 and for Uxbridge and South Ruislip from 2015 to 2023.

In his youth Johnson attended Eton College and Balliol College, Oxford, and he was elected president of the Oxford Union in 1986. In 1989 he began writing for The Daily Telegraph, and from 1999 to 2005 he was the editor of The Spectator. He became a member of the Shadow Cabinet of Michael Howard in 2001 before being dismissed over a claim that he had lied about an extramarital affair. After Howard resigned, Johnson became a member of David Cameron's Shadow Cabinet. He was elected mayor of London in 2008 and resigned from the House of Commons to focus his attention on the mayoralty. He was re-elected mayor in 2012, but did not run for re-election in 2016. At the 2015 general election he was elected MP for Uxbridge and South Ruislip. Johnson was a prominent figure in the Brexit campaign in the 2016 EU membership referendum. After the referendum, Prime Minister Theresa May appointed him foreign secretary. He resigned from the position in 2018 in protest at both the Chequers Agreement and May's approach to Brexit.

The 2017 United Kingdom general election was held on Thursday 8 June 2017, two years after the previous general election in 2015; it was the first since 1992 to be held on a day that did not coincide with any local elections. The governing Conservative Party led by Prime Minister Theresa May remained the largest single party in the House of Commons but lost its small overall majority, resulting in the formation of a Conservative minority government with a confidence and supply agreement with the Democratic Unionist Party (DUP) of Northern Ireland.

The Conservative Party, which had governed as a senior coalition partner from 2010 and as a single-party majority government from 2015, was led by May as Prime Minister. It was defending a working majority of 17 seats against the opposition Labour Party led by Jeremy Corbyn. It was the first general election to be contested by either May or Corbyn as party leader; May had succeeded David Cameron following his resignation as prime minister the previous summer, while Corbyn had succeeded Ed Miliband after he resigned following Labour's failure to win the general election two years earlier.

Rishi Sunak (born 12 May 1980) is a British politician and former investment banker who served as Prime Minister of the United Kingdom and Leader of the Conservative Party from 2022 to 2024. Following his defeat to Keir Starmer's Labour Party in the 2024 general election, he became Leader of the Opposition, serving in this role from July to November 2024. He previously held two Cabinet positions under Boris Johnson, latterly as Chancellor of the Exchequer from 2020 to 2022. Sunak has been Member of Parliament (MP) for Richmond and Northallerton, previously Richmond (Yorks), since 2015.

Sunak was born in Southampton to parents of Indian descent who immigrated to Britain from East Africa in the 1960s. He was educated at Winchester College, studied philosophy, politics and economics at Lincoln College, Oxford, and earned a Master of Business Administration from Stanford University in California as a Fulbright Scholar. During his time at Oxford University, Sunak joined the Conservatives. After graduating, Sunak worked for Goldman Sachs and later as a partner at two hedge fund firms. Sunak was elected to the House of Commons at the 2015 general election. As a backbencher, Sunak supported the successful campaign for Brexit in the 2016 European Union membership referendum. Sunak was appointed to the junior ministerial position of Parliamentary Under-Secretary of State for Local Government by Theresa May in 2018, and was appointed to the cabinet-attending role of Chief Secretary to the Treasury by Johnson in 2019.

The Cameron–Clegg coalition was formed by David Cameron and Nick Clegg when Cameron was invited by Queen Elizabeth II to form a new government, following the resignation of Prime Minister Gordon Brown on 11 May 2010, after the general election on 6 May. It was the UK's first coalition government since the Churchill war ministry ended in 1945.

The coalition was led by Cameron as prime minister with Clegg as deputy prime minister and composed of members of both Cameron's centre-right Conservative Party and Clegg's centrist Liberal Democrats. The Cabinet was made up of sixteen Conservatives and five Liberal Democrats, with eight other Conservatives and one other Liberal Democrat attending cabinet but not members. The coalition was succeeded by the single-party, second Cameron ministry following the 2015 election.

The Liberal Democrats, colloquially known as the Lib Dems, is one of the major political parties in the United Kingdom. Ideologically adhering to liberalism, it was founded in 1988. The party is based at Liberal Democrat Headquarters, which since September 2025 has been based at Buckingham Gate, in the Westminster area of Central London. The party's leader is Ed Davey. It is the third-largest party in the United Kingdom, with 72 members of Parliament (MPs) in the House of Commons. It has 75 members of the House of Lords, 5 in the Scottish Parliament, 1 in the Welsh Senedd, and around 3,200 local council seats. The party holds a twice yearly Liberal Democrat Conference, at which policy is formulated. In contrast to its main opponents, the Lib Dems grant all members attending Conference the right to vote on policy, under a one member, one vote system. As well as voting in the Conference Hall, the party allows its members to vote online for its policies and leadership elections. Members are also free to join organisations representing strands of party thinking, such as Liberal Reform and Social Liberal Forum, and for those under 30 years, Young Liberals.

In 1981, an electoral alliance was established between the Liberal Party, a group which descended from the 18th-century Whigs, and the Social Democratic Party (SDP), a splinter group from the Labour Party. In 1988, the parties merged as the Social and Liberal Democrats, adopting their present name a year later. Under the leaderships of Paddy Ashdown and Charles Kennedy, the party grew in the 1990s and 2000s, focusing its campaigns on specific seats and retained the third-largest party status in the House of Commons, although with significantly more seats than the predecessor Liberal Party. In the 1997 election, the Liberal Democrats doubled their seat count to 46. In 2010, under Nick Clegg's leadership, the Lib Dems were junior partners in the Conservative-led coalition government, in which Clegg served as deputy prime minister. Though it allowed the party to implement some of its policies, the coalition damaged its electoral standing; it lost 48 of its 56 MPs at the 2015 general election, which relegated it to fourth-largest party in the House of Commons. Under the leaderships of Tim Farron, Vince Cable and Jo Swinson, the party refocused as a pro-Europeanist party opposing Brexit. In the 2019 general election, the party garnered 11.5% of the vote on an anti-Brexit platform, but this did not translate into seat gains. However, the party's success was renewed under the leadership of Ed Davey, winning hundreds of councillors and 72 MPs in the 2024 general election, its highest result since 1923, and resuming its status as the third largest party in the House of Commons.

Theresa May served as home secretary from 2010 until 2016. As a member of David Cameron's first government May was appointed as home secretary on 12 May 2010, shortly after Cameron became prime minister, and continued in the post as part of the second Cameron government following the 2015 general election. She held the post until she succeeded Cameron as prime minister on 13 July 2016. May was the second woman to be appointed as home secretary (after Jacqui Smith), and the fourth woman to hold one of the Great Offices of State.

The longest-serving home secretary since James Chuter Ede over 60 years previously, May pursued reform of the Police Federation, implemented a harder line on drugs policy including banning khat and brought in further restrictions on immigration. She oversaw the introduction of elected police and crime commissioners, police investigations including Operation Yewtree, the deportation of Abu Qatada and the creation of the College of Policing and the National Crime Agency.

Uxbridge and South Ruislip is a constituency in Greater London represented in the House of Commons of the UK Parliament since its 2010 creation. The seat has been held by Danny Beales of the Labour Party since July 2024.

From 2015 to 2023, the seat was held by former Prime Minister (2019–2022) Boris Johnson, of the Conservative Party. Johnson won the seat in 2015 with a majority of 10,695. In 2017, as Foreign Secretary, he won a narrower majority of 5,034 votes. In 2019, as Prime Minister, he won an increased majority of 7,210. Johnson formally resigned in June 2023 after receiving a copy of the Standard Committee's report into Partygate, which recommended a recall petition. The subsequent by-election was won by Conservative candidate Steve Tuckwell, who then lost the seat to Danny Beales in the 2024 general election.