John Healey quit as defence secretary on Thursday after sending a two-page resignation letter to the Prime Minister on X, saying he had no option but to step down over the government's defence funding plan.
The resignation lands at a moment when Britain is already wrestling with what Healey described as rising threats, and it turns a spending fight inside government into an open break at cabinet level. He said the plan being pushed through could leave the country less safe and force decisions that would reduce the readiness of the armed forces while increasing the risk to personnel on operations.
In his letter, Healey said an extensive cross-government review finished in January had already confirmed the scale of the challenge and the rising demands on defence. He said that work had been overseen by the Prime Minister, himself and the Chancellor, but that since then the Prime Minister had been unable, and the Treasury unwilling, to commit the resources the nation needs to defend the country.
That is the crux of the dispute. Healey is not saying the threat has changed since January; he is saying the government was shown the problem and still has not matched it with money. By putting that charge in a public resignation letter, he has framed the argument as one about readiness, not accounting, and placed the Prime Minister and the Treasury squarely in the firing line.
Who replaces Healey as defence secretary was not immediately clear. For now, the only certainty is that the government's handling of armed forces funding has produced a resignation from one of the senior figures responsible for it, and the row is now out in the open.
