Rachel Reeves should be sacked as Chancellor if the Treasury continues to delay publishing its multibillion-pound investment plan for Britain’s defence, the boss of Britain’s largest union has said.

Sharon Graham, the general secretary of Unite, blasted both Ms Reeves and Keir Starmer for dithering over producing Labour’s plan to revitalise Britain’s armed forces.

Warning that Labour was putting tens of thousands of jobs at risk, the union boss said: ‘If Rachel Reeves can’t grasp that concept and doesn’t care where things are made then she should go.’

‘Actually, you have to have a vision for Britain.

‘You can’t just be in government, you can’t just say today’s a new day.’

The Unite boss also called on Sir Keir to ‘do what he said he would do’ and increase annual spending on the military to 2.5 per cent of GDP by 2027.

The Prime Minister last year pledged to meet a new Nato target to spend five per cent of the UK’s GDP on national security by 2035.

But ministers are now reportedly considering accelerating key milestones to hit three percent by 2029.

Sharon Graham, the general secretary of Unite, blasted both Ms Reeves and Keir Starmer for dithering over producing Labour’s plan to revitalise Britain’s armed forces

Warning that Labour was putting tens of thousands of jobs at risk, Unite boss Sharon Graham said: ‘If Rachel Reeves can’t grasp that concept and doesn’t care where things are made then she should go’

This comes as Sir Keir’s own armed forces minister said this week Britain has less than three years to prepare for war – but is by no means ready.

‘When it comes to deterring Russia, we have three to five years before we have to fight a significant confrontation with a major state, a geographically constrained conflict in some shape or form,’ former marine Al Carns told The Times.

Shadow Defence Secretary James Cartlidge said the intervention from Ms Graham – who has called for an end to Unite’s ‘obsession with the Labour Party’ – exposes ‘the gaping chasm on Labour’s defence spending rhetoric’.

He added: ‘Labour supporting Unions are now calling for the chancellor to resign if she doesn’t properly fund defence – this is chaos.

‘Our defence industry and armed forces are despairing at the lack of direction – the MOD need to urgently get a grip and finally publish their long overdue Defence Investment Plan (DIP).’

Labour was due to publish its ‘DIP’ last Autumn, which will set out how the government funds its transformation of the armed forces, but Treasury penny-pinching has caused repeated delays.

And it emerged this week that government spending on the military is set to account for a smaller share of GDP in 2027-28 than estimated last year, in a blow to Sir Keir’s efforts to meet his Nato targets.

Speaking to The Guardian, Ms Graham said on Wednesday: ‘Labour is supposed to be in for workers in the working class.

‘I’m seeing very little evidence of that.’

She also pointed to a lack of regard for workers across Labour’s Whitehall operation, and urged ministers to ‘back British industry’ by signing off on future defence contracts.

But a spokesperson from ADS, a trade organisation representing the aerospace, defence, security and space industries, told the Daily Mail: ‘Neither industry or military planners can do their jobs appropriately without the certainty provided by the financial backing of the DIP.

‘Announcements and intentions are all very well, but without the follow through businesses of all shapes and sizes are actively suffering with the in-year slowdown in spending.

‘Good intentions and good will to all are appreciated – but further delays in action are frustrating at best, and disruptive to business at worst.’

The ‘DIP’ had been expected to be published in the autumn, and then just before Christmas, but has been delayed to March or April.

It is intended to set out funding for £67 billion of commitments from last summer’s strategic defence review.

A Ministry of Defence spokesman said: ‘We are working flat out to finalise the Defence Investment Plan, which will deliver the best kit and technology into the hands of our frontline forces at speed, while investing in and growing the UK economy.’