PM survives day of high tension after Scots Labour leader Anas Sarwar urges him to step down amid Peter Mandelson row

• How the Downing Street machine ensured Starmer survived to fight another day

• Exclusive: Top civil servant could become third key No 10 departure in days

Keir Starmer has seen off an immediate challenge to his position from Labour’s leader in Scotland, telling his MPs he was “not prepared to walk away” from power and plunge the country into chaos.

But the prime minister emerged badly damaged from a tumultuous 24 hours which brought his premiership to the brink, leaving his party united for now but fearful of what the coming days and weeks will bring.