Poll shock for Sadiq Khan: Labour slumps, Reform UK climbs

A new poll shows Labour plunging from 43% in July to 32% now—an 11-point drop—marking a significant erosion of backing in one of the party’s traditional strongholds.

Nigel Farage’s Reform UK is the standout gainer, jumping eight points to 23%, putting the party in contention for major advances in next year’s local elections.

The Conservatives remain comparatively stable at 20%, down just one point. The Liberal Democrats dip slightly to 11%, while the Greens fall to 10%.

The shift comes as London remains one of the UK’s most left-leaning regions, making the rise of Reform UK particularly striking.

Labour’s outlook could worsen further as Chancellor Rachel Reeves prepares to unveil her Budget on Wednesday.

A proposed “mansion tax” targeting the ultra-rich is expected to hit more than 100,000 of Britain’s highest-value homes, most of them in London, with an average additional cost of around £4,500.

The Treasury is also poised to revalue 2.4 million properties in council tax bands F, G, and H.

Commenting on the polling, Chris Hopkins, political research director at Savanta, said: “Labour's struggles nationally chime with the latest London figures, down significantly from where they were 18 months ago at the general election," Express reported.