John Healey quit as Defence Secretary in June 2024 because he disagreed with Prime Minister Keir Starmer about how much to spend on the military, the BBC reported.

In his resignation speech to parliament on 16 June 2024, Healey said the government's defence spending plans "fall well short" of what is needed. The government was planning to spend 2.68% of the country's total wealth on defence. But Healey had promised, when he was in the job, to spend 5% by 2035. Labour had said this would be the biggest boost to defence spending since the Cold War.

The difference between 2.68% and 5% is the core of the argument. Healey's speech showed he believed the government was breaking its own promises.

Why this happened

During his time as Defence Secretary, Healey announced several spending increases. In spring 2025, he added £2.2 billion to the defence budget. Later that year he announced a £5 billion boost and said all 32 NATO countries had agreed to spend more on defence. The government called this the biggest defence spending increase since the Cold War ended.

Labour had used defence spending as part of its election campaign. The party said it would reach 5% spending by 2035, and Healey repeated this promise at the Labour Party Conference in 2025. But his resignation shows that the Treasury — the part of government that controls money — never actually planned to fund this target.

What happens now

Healey's departure leaves the Prime Minister without his main defence voice. The 5% promise — which Labour had used to set itself apart on security — now looks stuck in public view: the party said it but the money doesn't seem to be there.

The question for Westminster is whether the next Defence Secretary will keep the 5% target or let it drop quietly. The 2.68% plan is not nothing — it would still be above NATO's minimum of 2% — but it is far less than what Healey was asking for.

Defence spending is decided at Westminster, not by Scotland, Wales, or Northern Ireland. So the government's decision will affect the whole country. The only way the numbers change is through talks between the Treasury and the Ministry of Defence.

When a cabinet minister quits over money rather than a scandal, it usually matters more in the long run. It sets a public target that the next person in the job will be measured against. Healey has now set that target on the record in parliament.