London council elections could deliver Labour's worst London showing in 50 years

TL;DR: YouGov forecasts Labour’s poorest London council results in five decades, putting the party’s capital stronghold at risk.

Context London supplies one‑seventh of Labour’s MPs, including Prime Minister Sir Keir Starmer and Deputy Leader David Lammy. The capital has been Labour’s power base since the 2010 general election, delivering 59 of 75 seats in 2022 and three consecutive mayoral victories for Sadiq Khan. All 32 borough councils and five mayoralties are up for election next week, and the stakes are unusually high.

Key Facts - YouGov’s latest poll projects Labour could suffer its worst council performance in London in almost 50 years. - Mayor Sadiq Khan warned that Labour “risks being heavily defeated” across the city’s boroughs. - The Greens are targeting inner‑city councils such as Hackney, where they could unseat Labour after decades of control. - Reform UK and the Conservatives aim to make gains in the outer, more socially conservative boroughs. - In the 2022 local elections Labour held 21 councils; current modelling suggests several of those could slip away.

What It Means A significant loss of council seats would erode Labour’s grassroots network in the capital, weakening the pool of activists who select party leaders and campaign volunteers. With a sizable share of the party’s parliamentary representation tied to London, setbacks could reverberate beyond local government, intensifying internal debates about Sir Keir Starmer’s leadership. The projected swing toward the Greens reflects voter frustration over cost‑of‑living pressures, while the Reform surge signals a right‑leaning backlash in outer boroughs. Both trends expose Labour’s difficulty in balancing progressive policies with the fiscal concerns of a diverse electorate.

Looking ahead, the election night results will indicate whether Labour can retain its London heartland or if the capital is shifting toward a fragmented, multi‑party landscape. The outcome will shape strategic calculations for the party ahead of the next general election.