Zack Polanski has led the Green Party of England and Wales since winning a September 2025 leadership election with 84 percent of the vote, overseeing membership growth from around 68,500 to over 230,000 and gains including the party's first by-election win and record local results. Recent scrutiny has centered on his social media approach, an unlawful donation that required repayment, questions over his primary residence and council tax, and internal party motions warning of potential vote stagnation amid Labour's shift under Andy Burnham. A July 2026 internal debate highlighted frustration with his solo online presence, while personal approval ratings dipped after a public exchange with police leadership. The next scheduled leadership contest falls in 2027, though the Holborn and St Pancras by-election and autumn conference represent near-term tests of support.