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Prime Minister Keir Starmer could on Monday set out a timetable for his departure and usher in an orderly transfer of power to rival Andy Burnham, paving the way for Britain’s seventh leader in a decade.

Less than two years after Starmer won a landslide election victory that promised to end Britain’s chaotic politics, one source said he had spent the weekend considering whether to step aside or fight a leadership contest.

“Keir likes to think about things,” said the source on condition of anonymity.

The threat to Starmer, which has been building for months, increased sharply on Friday when Burnham, the Greater Manchester mayor, decisively won a parliamentary election to return to Westminster, beating a candidate from Nigel Farage’s Reform UK party which has led national opinion polls for more than a year.