On 19 June 2026, Andy Burnham, the Mayor of Greater Manchester, won the Makerfield by-election with 24,927 votes, beating Reform UK's Robert Kenyon by a majority of 9,231. The victory returns Burnham to Parliament for the first time in nine years and immediately positions him as a contender for the leadership of the Labour Party — and, by extension, the prime ministership. The by-election became a proxy battle for the future of Labour, and Burnham's win now sets up a direct challenge to the incumbent Labour Prime Minister, Keir Starmer.
Burnham's return to Westminster is the culmination of a carefully orchestrated campaign. He has spent months signalling his ambition, and in the days before the by-election he bolstered his economic team by bringing in three heavyweight advisers: Andy Haldane, a former Bank of England chief economist; Richard Hughes, a former chair of the Office for Budget Responsibility; and Jim O'Neill, a crossbench peer and former Treasury minister. The move was widely seen as an attempt to reassure financial markets that a Burnham-led government would maintain fiscal credibility. Burnham has said he has no plans to change the fiscal rules that Chancellor Rachel Reeves committed to before the last election.
“Andy Burnham's by-election win sets up a challenge to Keir Starmer. This explainer covers what happened and what comes next.”
The background to this challenge stretches back years. Burnham, who served as a Labour MP from 2001 to 2017 and stood for the party leadership in 2010 and 2015, lost his parliamentary seat in 2017. He then became Mayor of Greater Manchester. Starmer became Labour leader in 2020 and Prime Minister after the 2024 general election. However, Starmer has struggled to connect with the public and has faced internal discontent. Burnham's supporters argue that a change at the top could revive Labour's fortunes. The by-election itself was triggered when the previous Labour MP resigned, and Burnham stood as the candidate — a move seen as a stepping stone to a leadership bid.
For UK readers, the immediate implications are practical and political. A summer of Labour civil war is now likely, as Burnham is expected to try to oust Starmer within weeks. Burnham may first attempt to persuade Starmer to stand down voluntarily. If Starmer refuses, Burnham is expected to launch or join a formal leadership contest. Allies of Starmer have warned that a leadership battle could destabilise the economy and the country, though Burnham's team is confident of securing the necessary support from at least 81 Labour MPs to trigger a contest. The outcome could reshape British politics: Burnham has pitched himself as a unifying figure, warning that the country faces a "final chance to change" and urging his party to turn away from the "dark politics" seen in the United States.
Here are some key questions readers might have:
Q: What happened in the Makerfield by-election? Andy Burnham won the seat with 24,927 votes, defeating Reform UK's Robert Kenyon (15,696 votes) and others. Turnout was 58.75%. The result returns Burnham to Parliament and gives him a platform to challenge Keir Starmer for the Labour leadership.
Q: Why did Burnham bring in top economists? Burnham appointed former Bank of England chief economist Andy Haldane, former OBR chair Richard Hughes, and former Treasury minister Jim O'Neill as advisers. The move was designed to signal fiscal responsibility and reassure markets ahead of a potential leadership change, especially after Burnham had previously suggested the UK should be less influenced by bond traders.
Q: What happens next? Burnham is expected to hold talks with Starmer in the coming days. If Starmer refuses to set a date for his departure, Burnham will likely launch a formal leadership contest. Other potential candidates, such as Wes Streeting, have said they will stand. The outcome will be decided by Labour MPs and party members.
The immediate focus is on Friday morning, when bond markets will open after the by-election. Treasury officials and Number 10 will be watching closely for any signs of volatility. Burnham's victory speech offered a conciliatory but firm message: "People here have voted for change, they have voted for more power for the North and everywhere forgotten by Westminster. They have voted for hope. Now let's give that back to them." Whether he can turn that hope into a successful leadership bid — and eventually a prime ministership — remains to be seen.