Diane Abbott warned Sir Keir Starmer that abandoning his welfare reforms is the “only way”. The veteran left-winger was reacting after the Government made a series of concessions in a bid to quell a Labour rebellion over the Bill, which is aimed at slashing the benefits bill.

The PM was under intense pressure after 126 Labour backbenchers signed an amendment that would torpedo the legislation at a crunch vote next Tuesday. The Labour MP for Hackney North and Stoke Newington wrote on X: “Phoney ‘concessions’ will not fundamentally improve disability benefit cuts Bill. Dropping it is the only way.”

Work and Pensions Secretary Liz Kendall announced the climbdown in a letter last night.

She said people who currently receive the personal independence payment (Pip) will continue to do so and that adjustments to universal credit would also see incomes protected.

Other left-wing Labour MPs also took to X to warn that the concessions do not go far enough and that they would vote down the Bill.

Leeds East MP Richard Burgon said: “These changes may make a very bad Bill less awful.

“But the vast majority of cuts remain and it still forces hundreds of thousands into poverty. Nowhere near good enough.

“I’ll vote against the Bill. The Government shouldn’t be balancing the books on the backs of disabled people.”

Clive Lewis, who represents Norwich South, said: “Every MP will have to weigh up the deal for themselves.

“Alas, this smacks of a face-saving exercise more than it does doing right by my sick & disabled constituents.

“No impact assessment. No co-production with disabled groups. No deal. I’ll still be voting against.”

Nottingham East MP Nadia Whittome said the concessions “aren’t enough and they should worry us all”.

She added: “If you become disabled tomorrow, you risk not having the support you need.

“We would be condemning future generations of disabled people to greater poverty. I will be voting against the Bill.”

The Government’s original package restricted eligibility for Pip and limited the sickness-related element of universal credit.

A spokesperson for Number 10 said: “We have listened to MPs who support the principle of reform but are worried about the pace of change for those already supported by the system.

“This package will preserve the social security system for those who need it by putting it on a sustainable footing, provide dignity for those unable to work, supports those who can and reduce anxiety for those currently in the system.

“Our reforms are underpinned by Labour values and our determination to deliver the change the country voted for last year.”