PRIME MINISTER Sir Keir Starmer must “listen to voters” and ditch plans for spending cuts or people “will never forgive the Labour Party,” SNP Westminster leader Stephen Flynn warned today.

Chancellor Rachel Reeves will present Labour’s first Budget in 15 years in less than a fortnight.

But despite plans to raise an additional £40 billion in tax, she is facing increasing resistance both within and outside the party to cuts in departmental funding, believed in some cases to be as high as 20 per cent.

Now Mr Flynn has written to Sir Keir urging him to overrule Ms Reeves and block her plans for “devastating austerity cuts.”

His letter reads: “At the election, you promised voters that the Labour Party would end austerity cuts, but instead you are increasing them to a level not seen since the worst cuts of George Osborne.”

Referring to the widespread backlash against measures such as the exclusion of 10 million pensioners from winter fuel payments, he added: “It’s clear from the polls that the public are rapidly losing faith in your government as a result of the Chancellor’s decision to impose austerity cuts and now, it seems, even your own Cabinet ministers are losing faith in the Chancellor too.

“I urge you to listen to voters and your own Cabinet colleagues — intervene now, overrule the Chancellor and stop the cuts or people in Scotland will never forgive the Labour Party.”

A No 10 spokesman confirmed that the PM and Chancellor had agreed all “major measures” and overall departmental spending plans had already been submitted to the Office of Budget Responsibility for examination ahead of Budget day on October 30.

He warned that the annoucement would include “tough decisions” and that “not every department will be able to do everything they want to.”