Zack Polanski has been chosen to challenge Labour for Sir Keir Starmer's former Commons seat. The populist Green leader was unveiled as the party's candidate for the October 8 Holborn and St Pancras by-election this morning.He was picked ahead of local councillor Hamza Chowdhury, who ran against him with a blast at 'famous' candidates being parachuted in to fight for seats and then disappearing.Mr Polanski, who has said he will commute to Holborn from his home in trendy east London if he wins, will take on Labour's Sagal Abdi-Wali in a vote triggered by former prime minister Sir Keir's departure from Parliament. The seat has been held by Labour since it was created in 1983, but the Greens are confident they have a real chance of taking it.Coming on stage after a speech by Green MP Hannah Spencer he admitted he was already close to tears, and went on to say: 'We have the momentum and we can win.'He also shared his solidarity with Ms Abdi-Wali, a former child refugee born in Somalia, after 'despicable' criticism of her background by Reform's Zia Yusuf on X.The Green leader was unveiled as the party's candidate for the October 8 Holborn and St Pancras by-election this morning. Mr Polanski will take on Labour's Camden Council leader Sagal Abdi-Wali in a vote triggered by former prime minister Sir Keir's departure from Parliament