Diane AbbottKeir StarmerDavid MilibandZack PolanskiHannah SpencerJeremy CorbynAndrew FeinsteinLabour PartyGreen Party

Keir Starmer's resignation triggers London by-election; Green's Zack Polanski eyes seat as Labour weighs candidate amid Burnham effect

Keir Starmer's resignation has triggered a London by-election, with Green Party candidate Zack Polanski eyeing the seat. Labour is considering its candidate amid the 'Burnham effect,' which has shifted political dynamics, as Polanski faces challenges from past mistakes and declining party support.

independent.co.uk independent.co.uk1 September 2026 · 14:56 UTC
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Keir Starmer's resignation has set the stage for a significant London by-election, prompting speculation about potential candidates. Green Party's Zack Polanski is keen on the seat, having expressed a desire to represent London, where he has lived for over 20 years.2

Polanski's ambitions come at a time when Labour is weighing its options for a candidate. The Burnham effect, referring to the political shift following the new Prime Minister's rise, could play a crucial role in the by-election's outcome. Observers note that if Labour selects a strong candidate, they may retain the seat despite the challenges posed by Polanski's recent missteps and the Green Party's declining support in national polls.

In the previous election, independent candidate Andrew Feinstein garnered 19% of the vote, while the Green candidate secured another 10%, indicating a potential base for anti-Labour sentiment that could be mobilized in the upcoming by-election. However, Polanski's recent performance has raised concerns, with some suggesting he has made mistakes reminiscent of former Labour leader Jeremy Corbyn.

As the political landscape evolves, the outcome of this by-election could signal broader trends in voter sentiment and party dynamics in London and beyond.

Key Insight
“Polanski's path is complicated by a rough six months and ebbing Green poll support, partly due to Prime Minister Burnham's calming effect. In the last general election, independent Andrew Feinstein took 19% and the Green candidate 10%, showing a potential anti-Labour protest base.”
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1
independent.co.ukindependent.co.uk
“Having promised he would stay as an MP until the next election, he has decided, six weeks after quitting as prime minister, to stand down after all.”
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