Recent local election losses have intensified pressure on Prime Minister Keir Starmer, prompting cabinet resignations and positioning Greater Manchester Mayor Andy Burnham as the frontrunner for Labour leadership. Burnham’s approval to contest the Makerfield by-election, following an MP’s resignation to clear his path back to Parliament, has boosted his implied probability to 56.4 percent among traders. Polling among party members shows him well ahead of rivals such as Wes Streeting and Angela Rayner, both of whom have signaled potential challenges after resolving personal and ministerial issues. The 15.5 percent share for no change in 2026 reflects uncertainty over Starmer’s willingness to stand aside before any contest, while lower odds for other names track their narrower support bases and procedural hurdles ahead of a possible summer or autumn leadership vote.