Kemi Badenoch is to promise the โ€œbiggest uplift in defence spending in a generationโ€, funded by dramatic cuts to welfare. The Conservative leader will today announce plans to ensure the UK spends 3% of GDP on defence by 2029-30. She will argue there is a stark contrast between her approach and Andy Burnhamโ€™s failure to explain how he will boost defence spending, with Tories accusing the Labour Prime Minister of โ€œdither and delayโ€.

Mrs Badenoch said: โ€œThe first duty of every Government is defence, and the Conservatives will always put our defence first. Thatโ€™s why we are setting out our plans to reach 3% on defence spending by the end of this Parliament through further cuts to welfare and restoring the two-child benefit cap.โ€

John Healey, Mr Burnhamโ€™s Chancellor, resigned as Defence Secretary in July over former Prime Minister Sir Keir Starmerโ€™s failure to commit to meeting the 3% target. Mr Healey warned that the UK faced โ€œa new era of threatโ€ including growing danger from Russia. But he is expected to set out plans to spend 2.7% of GDP on defence in his Budget statement on October 28, with firm proposals to increase this to 3% and eventually to meet a NATO target of 3.5%, to be set out in a spending review next year.

The Tory defence boost will be funded partly by saving ยฃ4 billion annually through reforms to Housing Benefit, and ยฃ3.1 billion by reimposing the two-child benefit cap.

Conservatives would save another ยฃ1 billion by ending VAT exemptions for Motability vehicles, and ยฃ200 million by scrapping plans to hand the Chagos islands to Mauritius while leasing back a military base.

Shadow Defence Secretary James Cartlidge said: โ€œAndy Burnham came to office with no plan for how to fund our defence and no idea what to do about the out-of-control welfare bill.

โ€œThe longer he dithers and delays, the greater the risk to our security and to the British public, who will keep paying more and more in benefits while the armed forces who keep us safe have to make do with less and less.

โ€œThe Conservatives are clear: we must cut the welfare bill, reprioritise funding from other areas and invest an extra ยฃ10 billion a year in our armed forces so we can meet our 3% target, honouring our NATO commitments and keeping Britain safe.โ€

Shadow Chancellor Andrew Griffith added: โ€œThe Conservatives have already set out plans to cut the ballooning welfare bill by ยฃ23 billion, but now we are going further. Our changes will make the welfare system fairer at the same time as ensuring our country is fit to face growing global threats.โ€

Questioned in the House of Commons, Mr Burnham insisted he and the Chancellor would increase defence funding. He said: โ€œThe very reason I appointed this Chancellor to his position is because of his strong commitment to the defence of our country and to defence spending. We will fully fund the defence investment plan.

โ€œAt the spending review we will set out a plan to meet our NATO commitments by 2035. There is no problem with our commitment to defence.โ€