Analysts say although Polanski has gained popularity, toppling Labour in its traditional stronghold may be difficult.

Holborn and St Pancras has been held by Labour for 43 years, but the rise of the Greens could spell trouble as Keir Starmer steps down.

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…

Election will post early test for new prime minister Andy Burnham