The results in England, Scotland and Wales have piled pressure on Sir Keir, with some Labour MPs calling for him to set a timetable for his departure, although his cabinet allies have backed him for now.

Labour has lost power in Wales, ending its 27 year-long rule, while the SNP appears likely to remain the largest party in Scotland.

Reform UK has been the big winner in England, picking up more than 1,400 seats and taking control of councils in areas where Labour and the Conservatives have been historically dominant.