LABOUR is facing a May meltdown in elections for devolved parliaments and local authorities, latest polling confirms.

The party is on course for wipeout in Wales, a setback in Scotland and evisceration across England, particularly in “red wall” districts in the Midlands and north.

The Greens and hard-right Reform are set to be the beneficiaries in England, with nationalist parties winning in Scotland and Wales.

If the results on May 7 bear out these predictions it will revive pressure on Labour MPs to act to end Sir Keir Starmer’s disastrous leadership of their party and the government.

James Johnson, of JL Partners, which conducted the detailed survey for the Telegraph, said the research pointed to “a major political earthquake” across Britain.

“It could be the worst local election ever for Labour in England, a collapse for the Conservatives in their historic Blue Wall heartlands, and a brutal third place for Starmer’s party in Wales,” he said.

The figures point to a historic reverse for Labour in Wales. The survey estimates a win by Plaid Cymru, with 33 of the 96 seats in the Senedd, elected under a form of proportional representation.

Reform would hold 29 seats, with Labour a distant third on 17 in a country where they have been the leading party in all elections for nearly a century.

While the result might leave Labour able to join a coalition with Plaid, it would be the first time it has not led the Welsh government since devolution was introduced in 1999.

In England, Labour looks set to lose control of half the 83 authorities it presently runs, out of the 136 which are holding full or partial elections.

Many of those will be in London which, according to the JL poll, remains a moderately bright spot for Sir Keir.

While previous surveys have estimated that Labour would remain in full control of just two of the 32 councils in the capital, the latest survey says they may lead in 19.

Support for the Green Party is surging in London, but it may not be sufficient to secure Zack Polanski’s party control of more than a handful of councils.

On the right, Reform is set to make big gains from both Labour and the Tories, with Kemi Badenoch set to see her own “blue wall” in southern England crumble in favour of the Farageists.

At the high end of the predictions, Reform could gain control of up to 69 councils, including Essex, where Ms Badenoch has her own parliamentary constituency, despite a faltering and frequently farcical record running county councils it secured last year.

In Scotland, the poll has the Scottish National Party ahead in every region, with Reform and Labour vying for second place.

A further poll by Ipsos showed that most of the public expect the Greens and Reform to make big gains in the key elections and 56 per cent believe Labour will lose ground.

The cost of living, the state of the NHS and economic prospects will be the key issues affecting voting choices, although local issues also registered strongly in the poll.

Labour MPs speaking to the Star are generally resigned to calamity, although a few see some signs of resilience in the Labour vote in their own localities.

The Iran war appears to have improved Sir Keir’s prospects, at least to the extent that talk of an immediate challenge to his position is abating.

One leading left MP said they now expected the premier to limp on until the autumn, by which time it is hoped the war may be over and Manchester Mayor Andy Burnham may have secured a return to the Commons, allowing him to challenge Sir Keir.

However, if the forecasts projected materialise on polling day, and particularly if the results in London are worse than presently anticipated, an earlier contest could still be precipitated by Health Secretary Wes Streeting, former deputy prime minister Angie Rayner, or both.