Sir Keir Starmer is facing calls to set a timetable for his departure from Downing Street after Andy Burnham won a resounding victory in the Makerfield by-election, paving the way for a leadership challenge. A growing number of Labour MPs are urging Sir Keir to announce plans to hand power to the former Greater Manchester mayor, without the need for a potentially messy leadership contest. But the prime minister has insisted he will fight any challenge and will not "walk away" from the job.