Sir Keir Starmer has insisted he will not quit as prime minister and "plunge the country into chaos", as Labour reels from significant election losses.
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.
The BBC's projected national share (PNS), which is calculated from results in more than 1,000 wards and estimates a general election where people voted along similar lines, makes Reform the largest party, on 26% of the vote share.
