Zack Polanski Faces Decisive Test as Polls Close in Holborn and St Pancras

Polls have closed in the high-stakes Holborn & St Pancras by-election, presenting a critical juncture for Green Party leader Zack Polanski. The contest to succeed former prime minister Sir Keir Starmer in north London serves as a referendum on Polanski's controversial leftward shift of the party. While a victory would install Polanski as the sixth Green member of parliament, projections indicate a likely defeat against Labour candidate Sagal Abdi-Wali, potentially triggering a leadership challenge.

Pre-election projections from Poll Check estimated Labour securing approximately 40.4 percent of the vote compared to 35.6 percent for the Greens, leaving the contest tightly contested. Taking to social media as ballots were sealed, Polanski struck a defiant tone: 'The Green Party got 10 per cent last time. Whatever happens tonight - we made Labour work like they never have before.' Meanwhile, Conservative opponents issued sharp rebukes, with a spokesperson stating, 'If Zack Polanski fails to win this by-election, it will surely be curtains for his leadership of the party.'

Polanski's campaign operated under intense scrutiny following recent ideological rifts within the Green Party. The leadership skipped several sessions of the party's annual conference in Brighton, which recently adopted a controversial resolution classifying Zionism as racism. Since Polanski took control in September 2025, critics have argued that the party has moved excessively toward eco-populism and away from traditional environmental priorities, leading to public fallouts that dampened earlier momentum.

Holborn & St Pancras has served as an unbroken Labour stronghold since its creation in 1983, previously held by Frank Dobson for over three decades and Sir Keir Starmer for 11 years. Starmer retained the seat in 2024 with 48.9 percent of the vote, while the Greens secured just 10.4 percent. With Labour's national standing consolidating under new leadership, an eventual loss for Polanski would significantly undermine the Green Party's momentum following their historic council and by-election gains earlier this year.