Zack Polanski seeks to stand for by-election in former PM Starmer’s seat
Green Leader Eyes Starmer's Old Seat as By-Election Looms Over Holborn and St Pancras
Ninoda.com – The departure of Sir Keir Starmer from Westminster has opened one of the most politically charged vacancies in recent British electoral history, and the Green Party's national leader has moved quickly to claim the spotlight. Zack Polanski, who has spent years representing constituents in London's local government chamber as a member of the London Assembly, has publicly declared his intention to contest the by-election in the Holborn and St Pancras constituency. Should he succeed in winning the nomination and ultimately the seat, he would become the first Green MP ever elected to represent that London borough.
The timing of the announcement carries particular weight. Starmer stepped down as prime minister roughly two months before formally announcing his resignation as a member of Parliament, handing the premiership to Andy Burnham. The former PM's decision to vacate his parliamentary seat — which he had held continuously since 2015 — transforms what had been a routine post-election transition into a high-stakes contest that will test Labour's grip on one of its most urban, progressive strongholds.
Polanski's Personal Stake in the Constituency
Speaking to the Camden New Journal on a Thursday morning, Polanski framed his candidacy in deeply personal terms, emphasising long-standing ties to the neighbourhood rather than party strategy alone.
"I have lived and worked in this community over many years, I know it well and I love it. It represents so many of the things that make London so special. I am so excited by the prospect of representing this place in Parliament."
Those remarks underscore a candidate who positions himself as a local figure rather than a parachuted-in national leader. Polanski's existing role in the London Assembly gives him a platform within the capital's governance structures, though it does not translate into parliamentary experience. He has never sat in the House of Commons, a distinction that opponents will likely exploit during the campaign.
Internal Fractures Within the Green Base
Polanski's path to the nomination is not without complication. To become the official Green candidate, he must secure selection from local party members — a process his confident public statements suggest he expects to navigate smoothly. Yet recent reporting points to genuine tensions among grassroots activists in the area. A faction within the local Green movement is said to prefer a candidate whose campaign centres more explicitly on the Gaza conflict, raising questions about whether Polanski's broader national leadership profile aligns with the priorities of the most vocal local supporters.
Compounding the uncertainty is the potential entry of Andrew Feinstein, the independent candidate who finished second to Starmer in the 2024 general election in this very constituency. If Feinstein chooses to stand again, the anti-Labor vote could fracture across multiple non-Labour tickets, altering the arithmetic of a seat that Labour has held for nearly a decade.
Starmer's Exit and the International Agenda
The former prime minister had previously indicated he would retain his parliamentary seat until the next general election, which under current statutory timelines is not due before 2029. His decision to leave earlier than that represents a notable shift. In explaining the move, Starmer described it as the appropriate moment to hand over his parliamentary responsibilities to a successor.
"I will now focus on other things and that will be international affairs including defence, security, trade and technology in a fast-changing world."
He added that he would continue his established work on violence against women and girls, signalling that his post-parliamentary career will retain a strong policy dimension even without a Westminster mandate. The framing positions his departure not as a retreat but as a reorientation toward multilateral and global governance roles.
Electoral Arithmetic and What Comes Next
Holborn and St Pancras has long been regarded as a Labour bastion within London, a constituency where the party's vote share has comfortably exceeded fifty percent in recent general elections. The Greens, however, posted their strongest local results in the area during council elections earlier this year, finishing second to Labour in several wards. That performance provided the organisational confidence for Polanski to target the parliamentary seat with a realistic, if ambitious, expectation of competitive results.
No date has yet been fixed for the by-election. Under the Representation of the People Act, a by-election must be held within six months of the vacancy arising, but the precise scheduling depends on administrative preparations and, in practice, on the political calculus of the government now led by Burnham. A later date would allow more time for campaign mobilisation on all sides, while an earlier date could catch opposition parties less prepared.
For Labour, the contest carries implications well beyond one London borough. A loss — or even a significantly narrowed majority — in a seat the party has held since the mid-2010s would feed into narratives of urban electoral erosion that the Greens have cultivated over successive election cycles. For the Greens, a win would represent a historic breakthrough: a parliamentary presence in Westminster for the first time in a constituency of this profile, and a platform from which to press legislative agendas on climate, housing, and social policy from within the chamber itself.
The coming weeks will reveal whether Polanski can unify his local base, whether Feinstein enters the race, and how quickly the by-election machinery is activated. What is already clear is that Starmer's departure has turned a quiet London constituency into a national political event, and that the contest over his old seat will be watched far more closely than a typical by-election warrants.
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