How is a new prime minister chosen in the UK without an election?

How is a new prime minister chosen in the UK without a general election? Voters elect MPs, not prime ministers. The prime minister is the person the monarch appoints as leader of the party that can command a majority in the House of Commons. If a prime minister resigns between elections, the governing party picks a new leader under its own rules, the outgoing prime minister resigns to the King, and the King asks the new leader to form a government. No national vote is needed.

The process was used in 2026, when Andy Burnham replaced Sir Keir Starmer, and twice in 2022 under the Conservatives. This guide explains each step, using the 2026 handover as a worked example.

Why the UK does not directly elect its prime minister

At a general election, voters in each constituency choose a Member of Parliament. The party that wins a majority of seats, or can otherwise command the support of the Commons, forms the government, and its leader becomes prime minister. The job comes from the leader’s position in Parliament, not from a personal mandate.

That is why a change of leader in the governing party can produce a change of prime minister without an election. The party’s majority in the Commons stays the same; only the person leading it changes. In 2026 the King formally appointed Burnham as prime minister on 20 July, days after he became Labour leader as the only candidate in the contest, as the Institute for Government (IfG) records.

How is a new prime minister chosen? Step by step

1. The sitting prime minister resigns or is forced out

A change usually starts when the prime minister decides to go, often under pressure from their own MPs. A party can also challenge its leader under its own rules. In 2026, after Labour lost more than 1,400 council seats in England and fell to third place in the Welsh Senedd election in May, a growing number of Labour MPs publicly questioned Starmer’s future, some calling for a departure timetable, PoliticsHome reported. He resigned as Labour leader on 22 June 2026, according to the IfG, but stayed on as prime minister until a successor was chosen.

Staying on in this way meant the country still had a prime minister in post while Labour ran its contest.

2. The party runs a leadership election

Each party sets its own rules for choosing a leader, so the process differs between Labour, the Conservatives and others. Under Labour’s rules, a candidate needs nominations from 20% of the party’s MPs, which in 2026 meant 81 MPs, plus backing from affiliated organisations including trade unions, PoliticsHome reported. MP nominations opened on 9 July. According to the IfG, Burnham was nominated by 379 Labour MPs, leaving no other candidate able to reach the threshold, and when only one candidate is nominated, that person becomes leader without a members’ ballot. His GOV.UK profile records him as elected Labour leader on 16 July 2026; the IfG gives the date as 17 July.

3. Resignation and appointment at the palace

Once the party has a new leader, the formal handover takes place on a single day. On Monday 20 July 2026, Starmer gave a final statement outside 10 Downing Street offering his resignation, then went to Buckingham Palace to resign formally to the King, NPR reported. Burnham followed him to the palace and accepted the King’s invitation to form a government. In his first Downing Street speech, Burnham said Britain must show “that we can regain our stability”.

Along with the title of Prime Minister, the role carries other offices. According to GOV.UK, Burnham is also First Lord of the Treasury, Minister for the Civil Service and Minister for the Union.

4. The new prime minister appoints a cabinet

The new prime minister then chooses ministers. In 2026 that began on the day Burnham took office. ITV News reported that Burnham’s first cabinet included John Healey as Chancellor, Ed Miliband as Foreign Secretary, Shabana Mahmood as Home Secretary and Wes Streeting as Defence Secretary, with Louise Haigh as Chancellor of the Duchy of Lancaster and First Secretary of State. He did not appoint a deputy prime minister.

Why Burnham needed a Commons seat first

In 2026 Burnham was Mayor of Greater Manchester, not an MP, and he needed a seat in Parliament before he could stand for the Labour leadership. In January, the officers’ group of Labour’s National Executive Committee had blocked him from standing at the Gorton and Denton by-election, PoliticsHome reported.

The route back came on 14 May, when Makerfield MP Josh Simons announced he would stand down so that Burnham could contest his seat, PoliticsHome reported. MPs cannot technically resign. Instead, as the Hansard Society explains, they take a nominal Crown office, the Chiltern Hundreds or the Manor of Northstead, which disqualifies them from the Commons and leaves a vacancy. Burnham won the Makerfield by-election on 18 June 2026 with 54.8% of the vote, according to the IfG and LBC. He then left the mayoralty, and Labour’s Bev Craig won the Greater Manchester mayoral by-election, declared on 31 July, LBC reported.

By-elections can also follow a death or a successful recall petition. Our report on Nigel Farage’s resignation in Clacton shows another way a sitting MP can trigger one.

Does a new prime minister have to call a general election?

No. A change of prime minister does not reset the clock on the Parliament. According to the House of Commons Library, the next general election must be held by 15 August 2029, although the prime minister has the power to call one earlier.

Whether a new leader should seek a fresh mandate is a political argument, not a legal requirement. In 2026, Burnham’s opponents argued that he should test public opinion after taking over, and a Freshwater Strategy poll for City AM in early July found 65% of respondents thought a new prime minister should call an immediate general election. Burnham ruled out an early election in a BBC interview, saying he would honour Labour’s 2024 manifesto, the PA news agency reported on 27 July. PA also noted that Liz Truss and Rishi Sunak had both become prime minister in 2022 without a public vote. He remains committed to that manifesto, Euronews has reported.

What changes, and what stays the same

• Stays the same: the MPs elected at the last general election, the party balance in the Commons and the latest date for the next election.
• Can change quickly: the cabinet and the government’s priorities. Burnham, for example, opened a prime minister’s office in Manchester, No10 North, to drive devolution and local economic growth.
• The manifesto: a new leader may choose to stay bound by the promises made at the last election, as Burnham has said he is, while signalling possible new directions for the future.

For voters, the practical effect can be large even without an election. A new prime minister often brings a different style, a reshaped cabinet and new policy emphasis, as the period after Labour’s heavy election losses in May 2026 showed.

Frequently asked questions

Who chooses the UK prime minister?

The monarch formally appoints the prime minister, but in practice it is the leader of the party that commands a majority in the Commons. Between elections, that party’s own leadership rules decide who that is.

How long does it take to choose a new prime minister?

It depends on the party’s contest. In 2026, about four weeks passed between Starmer’s resignation as Labour leader on 22 June and Burnham’s appointment on 20 July, including a nomination period that opened on 9 July.

Who is the UK prime minister now?

As of October 2026, the Prime Minister is Andy Burnham, Labour MP for Makerfield, who took office on 20 July 2026.

When is the next UK general election?

It must be held by 15 August 2029. The prime minister can choose to call it earlier.

Sources: GOV.UK, The Rt Hon Andy Burnham MP (accessed 29 October 2026); GOV.UK, Andy Burnham’s first speech as Prime Minister (20 July 2026); GOV.UK, Keir Starmer’s final speech as Prime Minister (20 July 2026); GOV.UK, No10 North open for business (23 July 2026); Institute for Government, How do Labour Party leadership contests work? (accessed 29 October 2026); House of Commons Library, The next elections bill (accessed 28 October 2026); Hansard Society, Why MPs can’t just quit: the Chiltern Hundreds explained (Parliament Matters, episode 129) (1 February 2026); PoliticsHome, Andy Burnham blocked by Labour from running in by-election (25 January 2026); PoliticsHome, Starmer enters the danger zone (8 May 2026); PoliticsHome, Josh Simons to step down as MP to pave way for Andy Burnham (14 May 2026); LBC, Makerfield by-election result: Key numbers and historical trends (19 June 2026); PoliticsHome, Burnham expected to become Prime Minister after special conference on 17 July (23 June 2026); City AM, Brits say Burnham should call an election (7 July 2026); NPR, Andy Burnham succeeds Keir Starmer as the U.K.’s 7th prime minister in 10 years (20 July 2026); ITV News, Andy Burnham’s cabinet: Who’s in and who’s out? (21 July 2026); PA news agency via Nation.Cymru, Burnham rules out calling an early general election (27 July 2026); LBC, Labour’s Bev Craig wins Greater Manchester mayoralty to succeed Andy Burnham (31 July 2026); Euronews, UK Prime Minister Andy Burnham wants ‘honest discussion’ on return to EU free movement (25 October 2026).