The Green Party has selected Polanski as its candidate for Holborn and St Pancras, the London constituency vacated by Prime Minister Sir Keir Starmer. Party leadership framed the candidacy as an underdog bid in a seat long dominated by Labour, yet expressed confidence in the party's electoral prospects there.
The selection reflects the Greens' intensifying push into urban strongholds traditionally held by Labour. Holborn and St Pancras, centered in central London's Westminster district, has been a safe Labour seat for decades. Starmer's departure to Number 10 following Labour's July 2024 general election victory opened the door for a competitive by-election, creating what the Greens view as a genuine opportunity to breach Labour's metropolitan fortress.
The Green Party's strategic calculus here mirrors a broader trend across British politics. The Greens captured four parliamentary seats in July's general election, their strongest ever result, riding discontent over Labour's positioning on Gaza and environmental commitments. That breakthrough established them as a tangible electoral force beyond protest-vote territory, particularly among younger urban voters and constituencies with substantial progressive activist bases.
London's central constituencies present fertile ground for Green recruitment. These areas skew highly educated, lean heavily pro-Remain on Brexit, and show pronounced concern over climate policy. The Greens' absolutist stance on environmental issues and foreign policy increasingly resonates where Labour attempts to occupy the political center. A Green victory in Holborn and St Pancras would expand their parliamentary footprint dramatically, giving them a second MP in London and heightening their profile on the opposition benches.
Labour faces genuine vulnerability here despite historical dominance. The party's current polling position remains strong nationally, but local by-election dynamics operate differently from general elections. Turnout typically plummets in by-elections, which amplifies the voting power of ideologically committed candidates' supporters. Green activists, particularly on climate and Gaza issues, represent exactly the type of mobilized base capable of outperforming in low-turnout contests.
The seat's specific demographics favor Green outreach. Holborn and St Pancras contains parts of the London School of Economics, University College London, and King's College London campuses. Student and academic populations consistently deliver Green votes at higher rates than general adult populations. The constituency also encompasses significant migrant communities, particularly concerned with foreign policy questions where Labour and the Greens diverge sharply.
Green Party leader Carla Denyer's public confidence about winning signals the party views this not as a protest candidacy but as a genuine pathway to victory. This represents substantial strategic evolution from the Greens' historical positioning in Labour-held seats, where they traditionally ran symbolic campaigns.
The by-election timing remains unclear, as Starmer has not yet formally announced when Parliament will schedule the contest. Labour will deploy significant resources to defend the seat and avoid the political damage of losing a central London constituency to the Greens. Such a defeat would carry symbolic weight beyond parliamentary arithmetic, signaling Labour's bleeding of progressive voters on its left flank precisely when the party holds executive power and must defend its governing record.