Half of voters who backed Labour at the last General Election are fleeing to other political parties, damning internal polling shared with MPs has revealed.

The data showed that Reform UK is set to be the greatest beneficiary of the exodus.

Nigel Farage’s party, already flying high in the polls, could receive a boost from around 11 per cent of 2024 Labour voters.

Nine per cent of former Labour supporters have broken for the Green Party and six per cent for the Liberal Democrats.

Just three per cent switched their backing to the Tories.

The data shows that Labour has lost a roughly equal number of previous voters to both its right and its left.

However, indecision ruled a plurality of the respondents, with 14 per cent of voters are now undecided on who to support.

The internal polling was collected by Labour and has been seen by PoliticsHome.

Labour MP Alex Sobel said: “This polling lays bare the existential threat facing Labour and, more importantly, facing the country if we fail to win back the public.”

He added: “We risk paving the way for a Reform-led government.”There isn’t much time left to set a new course before the public’s view of Labour is baked in.

“Labour must reconnect with the mainstream of the party and let its principles shine to speak to the country once more,” the MP for Leeds Central and Headingley.

The polling follows a similar trend to what was witnessed in the recent Caerphilly by-election.

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Labour, which first won the South Wales seat in 1918, collapsed into third place, trailing both Reform UK and eventual victors Plaid Cymru.

The bruising polling comes at an already difficult time for Sir Keir Starmer, as his premiership was rocked by briefings about a potential coup from within his cabinet.

On Tuesday night, unnamed No10 sources issued a hostile briefing against Health Secretary Wes Streeting.

However, the Prime Minister we keen to throw cold water on the speculation as he leapt to the defence of Mr Streeting at PMQs.

Sir Keir said attacks on members of the Cabinet were “unacceptable”.

Earlier on Wednesday, the Health Secretary strongly denied the claims that he was plotting a coup against the Prime Minister.

He accused the anonymous sources of “watching too much Celebrity Traitors” and called for them to be sacked.

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