Greens leader Zack Polanski has said he is “confident, but not complacent” that his party will win the Gorton and Denton by-election, with less than a week before voters go to the polls.The politician visited the Greater Manchester constituency on Friday where campaigners had turned out to knock on doors and drum up support for candidate Hannah Spencer, a councillor and plumber.The seat was held by former Labour MP Andrew Gwynne, who won for Sir Keir Starmer’s party with more than half the vote in 2024, but he stood down earlier this year citing health reasons.