Here is a concise original summary based on the information published by the source. Zack Polanski’s star is fading The EconomistPolanski defends leadership of Greens and says he will not step down after byelection defeat by Labour – UK politics live The GuardianUK PM Burnham's Labour fends off left-wing Greens in London ReutersHolborn and St Pancras by election results live: Zack Polanski beaten by Labour The TelegraphLabour Holds Off Green Party in Election for Starmer’s Former London Seat The New York Times For the full context and any later updates, use the original source link.