Many Labour MPs have been left shellshocked after the chaotic political self-sabotage of the past week.

Bafflement, anger, disappointment, and sheer frustration are all on relatively open display at the circular firing squad which seems to have surrounded the prime minister.

The botched effort to flush out backroom plotters and force Wes Streeting to declare his loyalty ahead of the budget has instead led even previously loyal Starmerites to predict the PM could be forced out of office before the local elections in May.

“We have so many councillors coming up for election across the country,” one says, “and at the moment it looks like they’re going to be wiped out. That’s our base – we just can’t afford to lose them. I like Keir [Starmer] but there’s only a limited window left to turn things around. There’s a real question of urgency.”

Another criticised a “boys club” at No 10 who they claimed have “undermined” the prime minister and “forgotten they’re meant to be serving the British people.”

There’s clearly widespread muttering about what to do next – and even a degree of enviousness at the lack of a regicidal 1922 committee mechanism, as enjoyed by the Tories.

“Leadership speculation is destabilising,” one said. “But there’s really no obvious strategy. Andy Burnham isn’t even an MP. You’d need a stalking horse candidate and we don’t have one. There’s no 1922. It’s very messy.”

Others are gunning for the chancellor after months of careful pitch-rolling for manifesto-breaching tax rises in the budget were ripped up overnight.

“Her career is toast,” one told me. “Rachel has just lost all credibility. She screwed up on the manifesto. She screwed up on the last two fiscal events, costing the party huge amounts of support and leaving the economy stagnating.

“Having now walked everyone up the mountain of tax rises and made us vote to support them on the opposition day debate two days ago, she’s now worried her job is at risk and has bottled it.

“Talk to any major business or investor and they are holding off investing in the UK until it is clear what the UK’s tax policy is going to be, putting us in a situation where the chancellor is going to have to go through this all over again in six months – which just means no real economic growth for another six months.”

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After less than 18 months in office, the government is stuck in a political morass largely of its own making.

Treasury sources have belatedly argued that the chancellor’s pre-budget change of heart on income tax is down to better-than-expected economic forecasts from the Office for Budget Responsibility.

That should be a cause of celebration. The question is whether she and the PM are now too damaged to make that case to the country – and rescue their benighted prospects.

We’re told that Shabana Mahmood, the still new home secretary, is “a woman in a hurry”.

She’s been in the job for 73 days – and is now announcing “the most sweeping reforms to tackle illegal migration in modern times” – effectively since the Second World War.

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Her language is not just tough – it’s radical. Not what you’d have expected to hear from a Labour home secretary even just a few months ago.

“Illegal migration”, she believes, “is tearing our country apart. The crisis at our borders is out of control”.

Her team argues that those never-ending images of people crossing the Channel in small boats have led to a complete loss of faith in the government’s ability to take any action at all – let alone deliver on its promises.

The political reality is that successive failures of Tory and Labour ministers have fuelled the inexorable rise of Reform.

But speaking to Sir Trevor Phillips on Sky News, Ms Mahmood firmly hit back at suggestions today’s announcements are pandering to a racist narrative from the far right.

“It’s not right-wing talking points or fake news or misinformation that is suggesting that we’ve got a problem,” she said.

“I know, because I have now seen this system inside out. It is a broken system. We have a genuine problem to fix. People are angry about something that is real.

“It is my job, therefore, to think of a proper solution to this very real problem, to do so in line with my values as a Labour politician, but also as a British citizen, and to have solutions that work so that I can unite a divided country.”

There are many striking elements to this.

While she’s not been in the job for all that long, her government has been in power for 16 months. Her own press release highlights that over the past full calendar year asylum claims here have gone up by 18% – compared with a drop of 13% elsewhere in the EU.

The UK, she argues, has become a “golden ticket” for asylum seekers due to “far more generous terms” than other countries in Europe.

While she politely insists that her predecessor’s policies – the one in one out deal with France, closer partnership with law enforcement across Europe – are beginning to take effect, the message is clear. No one in office before Shabana has had the stomach to grasp the nettle.

The Home Office is determined to present their boss as the new hard woman of British politics.

In a bleak warning to those in her party who will be deeply uncomfortable with this unflinching approach, we’re told she believes this is “the last chance for decent, moderate politics”.

“If these moderate forces fail, something darker will follow…. if you don’t like this, you won’t like what follows me.”

That’s a clear reference to the anti-asylum policies of Reform and the Conservatives, who are pledging to leave the European Convention on Human Rights and deport all illegal arrivals.

Both parties have responded by effectively claiming they don’t trust Labour to deliver on this, given they believe the government has lost control of our borders and overseen a surge in asylum claims.

That much Ms Mahmood herself has already acknowledged.

It’s unusual to hear a Conservative shadow minister like Chris Philp responding to a government announcement by claiming they will support the “sensible steps” the Home Office is making.

Unsurprisingly, he went on to belittle her ideas as “very small steps” combined with “gimmicks” – but the main thrust of his critique was that Labour lacks the authority to push these kinds of measures through parliament, given the likely opposition from their own left wingers.

It’s a fair point – but the lack of fundamental disagreement highlights the threat these plans pose to her opponents.

If the government looks like it might actually succeed in bringing down the numbers – and of course that’s a colossal if – Ms Mahmood will effectively have outflanked and neutralised much of the threat from both the Tories and Reform.

That’s why she’s so keen to mention her Danish inspiration – a centre-left government which managed to see off the threat from right-wing parties through its tough approach to migration, without having to leave the ECHR.

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The Home Office is planning further announcements on new safe and legal routes.

But refugee charities have described the new measures as harsh, claiming they will scapegoat genuine refugees, fail to integrate them into society, and fail to function as a deterrent either.

There will surely be an almighty internal row among Labour MPs about the principle of ripping up the post-war settlement for refugees.

For a government floundering after the political chaos of the last few weeks and months, Ms Mahmood is a voice of certainty and confidence.

At a moment of such intense backroom debate over the party’s future direction, it’s hard to avoid seeing her performance this weekend as a starting pitch for the leadership.

Sir Keir Starmer and Rachel Reeves have scrapped plans to break their manifesto pledge and raise income tax rates in a massive U-turn less than two weeks from the budget.

The decision, first reported in the Financial Times, comes after a bruising few days which has brought about a change of heart in Downing Street.

Read more: How No 10 plunged itself into crisis

I understand Downing Street has backed down amid fears about the backlash from disgruntled MPs and voters.

The Treasury and Number 10 declined to comment.

The decision is a massive about-turn. In a news conference last week, the chancellor appeared to pave the way for manifesto-breaking tax rises in the budget on 26 November.

She spoke of difficult choices and insisted she could neither increase borrowing nor cut spending in order to stabilise the economy, telling the public “everyone has to play their part”.

The decision to backtrack was communicated to the Office for Budget Responsibility on Wednesday in a submission of “major measures”, according to the Financial Times.

The chancellor will now have to fill an estimated £30bn black hole with a series of narrower tax-raising measures and is also expected to freeze income tax thresholds for another two years beyond 2028, which should raise about £8bn.

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Conservative leader Kemi Badenoch said: “Only the Conservatives have fought Labour off their tax-raising plans.

“But one retreat doesn’t fix a budget built on broken promises. Reeves must guarantee no new taxes on work, businesses, homes, or pensions – and she should go further by abolishing stamp duty.”

How did we get here?

For weeks, the government has been working up options to break the manifesto pledge not to raise income tax, national insurance or VAT on working people.

I was told only this week the option being worked up was to do a combination of tax rises and action on the two-child benefit cap in order for the prime minister to be able to argue that in breaking his manifesto pledges, he is trying his hardest to protect the poorest in society and those “working people” he has spoken of so endlessly.

But days ago, officials and ministers were working on a proposal to lift the basic rate of income tax – perhaps by 2p – and then simultaneously cut national insurance contributions for those on the basic rate of income tax (those who earn up to £50,000 a year).

That way the chancellor can raise several billion in tax from those with the “broadest shoulders” – higher-rate taxpayers and pensioners or landlords, while also trying to protect “working people” earning salaries under £50,000 a year.

The chancellor was also going to take action on the two-child benefit cap in response to growing demand from the party to take action on child poverty. It is unclear whether those plans will now be shelved given the U-turn on income tax.

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The change of plan comes after the prime minister found himself engulfed in a leadership crisis after his allies warned rivals that he would fight any attempted post-budget coup.

It triggered a briefing war between Wes Streeting and anonymous Starmer allies attacking the health secretary as the chief traitor.

Read more: Is Starmer ‘in office but not in power’?

The prime minister has since apologised to Mr Streeting, who I am told does not want to press for sackings in No 10 in the wake of the briefings against him.

But the saga has further damaged Sir Keir and increased concerns among MPs about his suitability to lead Labour into the next general election.

Insiders clearly concluded that the ill mood in the party, coupled with the recent hits to the PM’s political capital, makes manifesto-breaking tax rises simply too risky right now.

But it also adds to a sense of chaos, given the chancellor publicly pitch-rolled tax rises in last week’s news conference.