A Seat Once Unassailable Now Faces Unprecedented Challenge
Britain’s Holborn and St Pancras parliamentary seat, a Labour stronghold since 1983, is set for its first serious contest in decades after Green Party leader Zack Polanski announced his candidacy. The by-election, triggered by former Prime Minister Keir Starmer’s standing down as the member of parliament, has become a battleground for the future of left-wing politics in the UK.
The Green Party’s Bold Move
Polanski’s decision to run in the seat marks a calculated risk for the Greens, who have never won a parliamentary seat in the constituency. His campaign hinges on recent local successes: in May’s Camden council elections, the Greens captured 28.8 percent of the vote, outperforming Labour’s 38.8. This surge follows a 2024 general election where the Greens secured 10.4 per cent in the area, trailing Starmer’s 48.9 per cent.
“A Green win would be a surprise,” said Jonathan Tonge, a politics professor at the University of Liverpool. “But the timing of the by-election and the Prime Minister’s performance will be critical.”
Labour’s Fragile Momentum
Prime Minister Andy Burnham’s “honeymoon period” could determine the outcome. A poorly received budget on October 28 might erode his popularity, while a strong party conference in September could prolong Labour’s advantage. Burnham, who took office after a scandal-free tenure as Greater Manchester mayor, enjoys a 46% favorable rating in a YouGov survey.
However, his left-leaning policies—echoed by Polanski—risk alienating centrist voters. “The ‘Burnham bounce’ could work against Polanski,” Tonge noted, adding that Labour’s traditional base remains wary of the Greens’ “too left-wing” image.
Polanski’s Controversial Track Record
Polanski’s path to the seat is fraught with obstacles. Critics highlight his 2015 council by-election campaign as a Liberal Democrat, where he earned 96 votes, and a recent controversy over unpaid council taxes on his houseboat. A Green Party spokesperson called the issue “unintentional,” while Polanski admitted to missing the May local election due to a move.
John McTernan, a former Tony Blair advisor, warned that Polanski’s candidacy could backfire. “By-elections often punish candidates seen as self-serving,” he said, citing the 2026 Clacton election where a novelty candidate gained 26.7% of the vote.
The Greens’ Rise and Limits
The Greens’ national momentum is undeniable. They won their first parliamentary by-election in February 2026 and captured 279 council seats in London, including Hackney and Lewisham. However, experts caution that their success may be tied to dissatisfaction with Starmer rather than Polanski’s personal appeal.
“The Greens have peaked,” Tonge argued. “Polanski’s 19% favorability rating in August shows his popularity is not universal.”
Labour’s Strategy and Tensions
Labour has resisted formal alliances with the Greens, fearing a loss of progressive voters. Recent reports indicate local Labour figures have blocked deals with Green councillors, citing concerns over “eroding their base.” Despite this, collaboration on specific issues persists, though not on a large scale.
Polanski has explicitly ruled out coalitions with Labour, stating, “We are here to replace you.” This stance contrasts with his earlier calls for unity among left-wing forces, highlighting the party’s dual role as both competitor and potential ally.
Frequently Asked Questions
What makes Holborn and St Pancras a key battleground?
The seat has been a Labour stronghold since 1983. Zack Polanski’s Green Party candidacy introduces a new dynamic, leveraging recent local successes and national momentum.
Can the Greens realistically win?
Experts consider a Green victory unlikely. However, the by-election could signal a shift in voter preferences, particularly if Labour’s popularity wanes.
How does Polanski’s background affect his campaign?
Polanski’s history as a Liberal Democrat and recent controversies may hinder his credibility. His focus on “eco-populism” resonates with some voters but alienates others.
Did You Know?
The Greens’ 2026 London council gains marked their largest-ever local election performance, yet their national support remains below 20%. This contrast underscores the challenges of translating local success to parliamentary politics.
Pro Tip: Monitor Labour’s October budget and the by-election timing. A delayed contest could amplify risks for the party, while a swift vote might solidify their advantage.
For more insights on UK politics, explore our coverage of Labour’s post-Starmer strategy and the Greens’ national rise.
What’s next for left-wing politics? The Holborn and St Pancras by-election could set a precedent for future contests. Share your thoughts in the comments below or subscribe to our newsletter for updates.
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