Under Labour's rules, a leader can be challenged if at least 20 per cent of the party's MPs nominate a single candidate to succeed him - on current numbers, this is 80 MPs.

Sir Keir Starmer is facing a crisis as two of his top aides quit and the Scottish Labour leader calls for him to go.

Sir Keir Starmer is facing a crisis as two of his top aides quit and the Scottish Labour leader calls for him to go.