In a move that left Westminster reeling, Sir Keir tendered his resignation as Labour 's MP for Holborn and St Pancras on the day Parliament resumed after the summer break.

Keir Starmer previously insisted he would stay on as the member for Holborn and St Pancras.

Former PM says it is right time to go, which will trigger byelection that Greens’ Zack Polanski could target

Greens will target former prime minister’s seat in central London byelection