Sir Keir Starmer is increasingly expected to announce that he will set out a timetable for his departure on Monday, as his leading challenger Andy Burnham arrives in Westminster. The prime minister, who spent the weekend discussing his political future with his family at Chequers, is believed to be preparing to unveil his resignation plan amid growing pressure to quit. No 10 has insisted Sir Keir’s position remained unchanged from Friday, when he said he would not “walk away” from Downing