Andy Burnham leads trader consensus at 58% as the likely next UK prime minister due to sustained Labour Party pressure on Keir Starmer following heavy May 2026 local election losses and multiple ministerial resignations, including that of Health Secretary Wes Streeting. Burnham, the Greater Manchester mayor, has positioned himself for a swift return to Parliament through an imminent by-election, with internal polling and party sentiment favoring him over alternatives like Angela Rayner or Ed Miliband as a broadly appealing successor. Starmer has vowed to continue, yet the absence of a triggered leadership contest keeps open the possibility that no change occurs in 2026, reflected in the 23.5% share for that outcome. Other named contenders trail with under 6% each amid ongoing uncertainty over the timing and process of any transition.