When Sir Keir Starmer announced that he was standing down as an MP on Tuesday, jubilation erupted among Green activists. Zack Polanski’s party has already proved it can take on Labour’s campaign machine in ethnically diverse parts of Manchester; Starmer’s resignation now presents the perfect opportunity to do the same in London. At the time

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