Sir Keir Starmer is facing an election nightmare in London as a new mega-poll reveals Labour is "under siege" from all sides.
A More in Common poll surveyed 2,646 adults across London and asked how they would vote over a three-week period.
This Thursday, polling stations will open across the UK as council by-elections are due to take place.
Also, Scotland and Wales will also be holding parliamentary elections, with the SNP and Plaid Cymru taking lead in the polls respectively.
The data shows Labour's support has dwindled by 15 points since the general election, whilst Zack Polanski's Green Party has moved up by 10 points in the capital.
Labour remains ahead in London, but is clinging on with just 28 per cent of support, with the Greens edging closer at 20 per cent, according to the More in Common poll.
The Green Party for the first time is due to win the highest vote share in a London borough, with it being the most popular party in east London's Hackney, with it leading by three points.
In Islington, Lambeth and Lewisham, Labour and the Greens are neck-and-neck, where Zack Polanski's party is within two points of the incumbent.
Despite the bleak picture, Labour remain ahead in the capital ahead of Thursday's council elections
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Reform UK has made strong gains in outer London, leading in Havering by nine points and surging to 24 per cent in Barking and Dagenham, where Labour won every seat in 2022.
Nigel Farage's party is also neck-and-neck with the Tories in the south east suburb of Bexley, which was Ted Heath's constituency from 1950 to 1974.
In Bromley, Reform are also coming for the Conservatives after they've risen to 21.3 per cent of the vote.
The Conservatives are set to face a difficult night, projected to lead in only five boroughs in the capital: Bexley, Bromley, Harrow, Hillingdon and Kensington and Chelsea.
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Britons will be heading to the polling station on Thursday as elections take place alongside Scottish and Welsh contests
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Their hopes of gains in Westminster and Wandsworth appear unlikely, as they still trail Labour by 11 and 7 points respectively in those areas.
The Liberal Democrats, despite limited progress since the last local elections, are expected to hold firm in affluent south-west London areas such as Richmond, Kingston and Sutton.
Luke Tryl, UK Director at More in Common, said: "The 2026 elections are set to show that the capital is not immune to the electoral fragmentation that has upended politics across the country.
"Former Labour strongholds look set to see major Green gains with the potential the party controls or emerges as the largest party in a whole swathe of inner London."
He continued to explain whilst the Greens continue to eat into Labour's traditional strongholds in the capital, Reform is mounting a similar challenge to the Tories in greater-London areas like Bexley – once considered rock-solid Conservative territory.
Mr Tryl also mentioned how Independent candidates are also expected to make inroads, with the political landscape of London potentially looking dramatically different to anything seen before.
He said: "Add in gains from Independents and it could well be that the electoral map of London we see on May 8th looks totally unrecognisable to what we have become used to."
In 2022, Labour gained over 40 per cent of the vote in two-thirds of the capital's boroughs. Today, they are not projected to pass this mark in a single area.
The poll also showed one in five Londoners are still undecided about how they will vote on Thursday.
Nineteen per cent are still unsure of who they will vote for as polling day looms, in comparison to 81 per cent are already sure.
On Thursday, voters across England will be voting on almost 5,000 council seats.
Initially, the Government wanted to delay the elections due to council reorganisation, which would have meant over 600 councillors' seats would not be up for vote.
However, the Government U-turned on this decision in February.
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