Zack Polanski remains Green Party of England and Wales leader following his September 2025 election, with recent developments centered on his September 2026 announcement seeking selection as the party’s candidate in the Holborn and St Pancras by-election triggered by Keir Starmer’s resignation. Party membership has more than tripled under his tenure amid local election gains and national polling strength, yet internal motions, member concerns over policy direction, and external scrutiny of donations, tax matters, and party associations have prompted isolated criticism and questions about long-term stability. The pending by-election and any associated selection process or party conference represent near-term focal points that could influence leadership dynamics, as could broader shifts in voter support or coalition discussions.