UK Defence Secretary John Healey resigns, criticising Starmer and Treasury over military funding

A scathing letter to the prime minister

The resignation is the latest flashpoint in a long-running dispute between Britain's defence and finance ministries over how to meet rising demands to expand military spending. Talks between the two departments have dragged on for months, delaying the publication of the Defence Investment Plan since last year. Healey had pressed for a bigger settlement to modernise the armed forces and signal commitment to NATO allies.

Britain's defence industry has publicly expressed frustration at the delay. Industry figures cited the United States pivoting away from protecting Europe as a factor sharpening their concerns, and warned that companies cannot commit to long-term programmes for the country's security while the funding plan remains in limbo. They argue that the uncertainty undermines Britain's industrial base at a moment of geopolitical volatility.

Industry warns of strain on defence investment

Healey's departure lands in the middle of what the article described as a 'beleaguered' stretch for Starmer's government, which is juggling economic pressures with commitments to lift defence spending. The resignation removes one of the more experienced voices around the cabinet table on security policy and raises immediate questions about who will take over the Ministry of Defence and whether the spending row will now be resolved or further inflamed.

Downing Street had not, at the time of writing, announced a successor. The resignation came as a surprise to some in Whitehall, where Healey had been considered a loyal and steady presence in cabinet. Allies said he had wrestled for weeks with whether to stay and fight for the budget or to make his objections public, ultimately concluding that the gap between what the military needed and what was on offer was too wide to bridge in post.

What happens next for the Ministry of Defence

The financial backdrop to the row is well-rehearsed. The Treasury has been grappling with strained public finances and a crowded set of spending demands, from the NHS to net-zero investment, while defence planners have argued that the threat picture, from Russia to the Indo-Pacific, justifies a step-change in funding. Healey's letter made clear which side of that argument he came down on, and at what personal cost.

His criticism also carried an implicit warning to allies. By publicly blaming the Treasury rather than confining his concerns to private cabinet discussion, Healey highlighted the risk that Britain could be perceived as slow to respond to a deteriorating security environment, particularly if the US continues to rebalance its priorities. The language of 'rising threats' was designed, officials said, to frame the dispute as a matter of national security rather than ordinary budgetary politics.