Westminster is witnessing the kind of prime ministerial instability which Canberra went through not so long ago, with Sir Keir Starmer facing yet another leadership crisis, which this time could be terminal.

It follows Labour's catastrophic performance in local council elections in England and parliamentary elections in Scotland and Wales. One of his most senior Cabinet secretaries, the former Health Secretary Wes Streeting, has resigned, and penned a stinging resignation letter — they are something of an art form in Britain — calling for Keir Starmer to go.