British Prime Minister Keir Starmer faces the most serious political crisis since his arrival at Downing Street in July 2024, but a potential change at the head of the government runs up against a web of internal Labour Party rules, the absence of a consensus candidate, and the personal obstacles weighing on the figure best positioned in internal polling. Starmer, who won the 2024 general election with an overwhelming majority, has flatly ruled out resigning despite mounting pressure from his own parliamentary group following Labour's collapse in the local and regional elections of 1 May.

Several frontbenchers told the Guardian they agreed the prime minister’s time in office should not go beyond the end of the year

Chances of Starmer remaining in No 10 appear to be diminishing as about 40 Labour MPs call for him to quit