The Green Party has won its first ever parliamentary by-election in Gorton and Denton, dealing a bitter blow to Sir Keir Starmer.Labour’s defeat, trailing in third behind Zack Polanski’s Greens and Nigel Farage’s Reform UK in the previously rock-solid Greater Manchester constituency, will pile pressure on the Prime Minister.Hannah Spencer, a councillor and plumber, emerged victorious for the Greens, with 14,980 votes and a majority of 4,402 votes.