Reform UK’s support has surged in London while backing for Labour languishes at a record low in the capital, according to a new poll.

The latest Savanta survey found Nigel Farage‘s party were supported by 23 per cent of voters in London, up from 15 per cent in June.

This put Reform ahead of the Tories, who were down one percentage point to 20 per cent, with the Liberal Democrats on 11 per cent (-2) and Greens on 10 per cent (-3).

Support for Labour was at 32 per cent, which is the joint lowest recorded by Savanta – who have polled London voters since 2020 – following the same result in June.

Labour’s backing in the capital has plummeted from 43 per cent since the general election in July 2024.

The findings come ahead of tomorrow’s Budget, when Chancellor Rachel Reeves is expected to announce a new ‘mansion tax’ on more expensive properties.

This will hit homes in London the hardest, while – if Ms Reeves also freezes income tax thresholds – more workers in the capital will be dragged into paying higher rates.

London has traditionally been a Labour stronghold, but the party’s support in the capital has also fallen as its popularity slumps across the wider country.

Meanwhile, Sir Sadiq Khan, Labour’s London mayor, has pushed through unpopular policies – such as expanding the ULEZ scheme – during his time in City Hall.

The latest Savanta survey found Nigel Farage’s Reform UK were supported by 23 per cent of voters in London, up from 15 per cent in June

Sir Sadiq Khan, Labour’s London mayor, has pushed through unpopular policies – such as expanding the ULEZ scheme – during his time in City Hall

The Savanta poll, commissioned by the Centre for London think tank, found Reform was ahead of both Labour and the Tories among Londoners aged 65 and over.

Mr Farage’s party were backed by 35 per cent among this age group, with Labour on 14 per cent and the Tories on 32 per cent.

Antonia Jennings, chief executive of Centre for London, said: ‘The political make-up of London has shifted.

‘This comes after decades of political parties ignoring Londoners’ struggles and underappreciating the capital’s role in the UK economy.’

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.

‘They keep their noses in front, but would be well on course to lose a lot of seats if these figures were replicated at a general election.

‘This will of course spell danger ahead of next year’s local elections in London.

‘The last equivalent elections were in 2022, and Labour came away with well over 1,100 seats.

‘That sort of result feels incredibly improbable on current polling, with Reform UK looking like a force in the capital for the first time ever.’