Recent Labour Party losses in local elections have triggered widespread calls for Keir Starmer to resign or set a departure timetable, with multiple cabinet members stepping down and over 90 MPs expressing dissatisfaction. Andy Burnham leads trader consensus as the likely next prime minister, driven by his announcement to contest the Makerfield by-election after a sitting Labour MP resigned to facilitate his return to Parliament, enabling a potential leadership challenge before the autumn conference. Among party members, surveys show strong preference for Burnham as replacement. Wes Streeting, who resigned as health secretary to pursue a bid, Angela Rayner following resolution of prior matters, and others such as Ed Miliband remain distant in implied probabilities, reflecting traders' assessment of Burnham's organizational and public support advantages in any contest.