Burnham seeks Westminster return in Makerfield by-election to challenge Starmer

Andy Burnham’s move into the Makerfield by-election is less a straight leadership challenge than a test of whether Labour’s next succession battle will reward metro-mayor pragmatism over Westminster pedigree. Before he can even appear as a credible rival to Keir Starmer, the Greater Manchester mayor must first win the seat and get back into the House of Commons.

The by-election will be held on Thursday 18 June 2026 after Josh Simons resigned as Labour MP on 14 May to clear the path for Burnham’s return. Labour has now selected Burnham as its candidate, after he sought permission from the party’s National Executive Committee. The contest is shaping up as a fight in a Labour-Reform marginal, with Labour taking Makerfield at the 2024 general election on 45.2% of the vote and Reform UK finishing second on 31.8%.

Burnham has said he would seek to enter any Labour leadership contest if he wins Makerfield and returns to Parliament. That ambition still faces a formidable procedural hurdle. Under Labour’s current rules, any challenger to Starmer would need the backing of 81 Labour MPs, or 20% of the parliamentary party, to trigger a contest. As the incumbent, Starmer would automatically be on the ballot and would not need nominations, a built-in advantage that makes any bid from outside Westminster far harder to organise.

Simons framed his resignation as an act of political sacrifice, saying he was standing aside so Burnham could return to Westminster and help lead the change he believes the country needs. He also said the party needed “urgent, radical, courageous reform” and a change in leadership. That language underlines the wider argument around Burnham’s appeal: not simply whether he can win a by-election, but whether Labour MPs and members would eventually see a mayor with a record in Greater Manchester as a more persuasive standard-bearer than a figure rooted in the Commons.

Burnham has already been blocked once by Labour’s National Executive Committee, which stopped him standing in the Gorton and Denton by-election earlier in 2026. That history makes Makerfield more than a local contest. If Burnham wins on 18 June, it will give him a Westminster route back into the national debate. If he loses, the leadership question will remain exactly where it is now, with Starmer secure and Burnham left shaping Labour’s direction from outside Parliament.