Zack Polanski, elected Green Party of England and Wales leader in September 2025, remains in post amid a mix of electoral gains and internal scrutiny. The party tripled membership and secured record council seats plus its first Westminster by-election win under his “eco-populist” approach, yet controversies over an impermissible personal donation, houseboat residency questions, career claims, and social-media posts have fueled internal debates about his combative style and solo media presence. His September 3, 2026 announcement to seek selection for the Holborn and St Pancras by-election—triggered by Keir Starmer’s resignation—tests support ahead of formal local party endorsement next week and could either consolidate or expose vulnerabilities if Labour rebounds under Andy Burnham. Scheduled party conferences and any formal leadership challenge motions remain the clearest near-term catalysts for change.