UK defence spending: minister presses Burnham on 3.5% GDP path

A senior government minister has publicly challenged Greater Manchester Mayor Andy Burnham to set out a credible roadmap for reaching the UK’s 3.5% of GDP defence spending target, escalating a simmering row over how Britain’s long-term military commitments should be funded and who bears responsibility for making the numbers work.

The demand from Westminster

The minister, speaking to reporters ahead of a scheduled Commons debate on defence procurement, said Burnham had been vocal in criticising the government’s spending timelines without offering anything concrete in return. “It’s easy to stand on the sidelines and talk about ambition,” the minister said. “What we need from regional leaders is a clear, costed position, not just rhetoric.” The comments come days after Burnham argued that hitting 3.5% of GDP — a figure significantly above NATO’s current 2% benchmark — could undermine public services unless accompanied by new fiscal frameworks.

The UK currently spends roughly 2.3% of GDP on defence, a figure that translates to approximately £59 billion annually. Getting to 3.5% would require an additional £30 billion or more per year, depending on economic growth projections. That’s not a rounding error. It’s a structural shift in national priorities.

Burnham’s position and the political backdrop

Burnham has positioned himself as a voice of caution within Labour’s broader orbit, repeatedly warning that headline defence pledges must not come at the cost of NHS funding, housing, or local government budgets. His stance has won him supporters among left-leaning MPs but irritated figures closer to the party’s national security wing, who argue that the geopolitical moment — shaped by the ongoing war in Ukraine and growing instability across NATO’s eastern flank — demands urgency rather than hesitation.

So the clash isn’t purely about percentages. It’s about what kind of Labour politics dominates the next decade.

Timeline pressure and NATO commitments

Britain’s commitment to increasing defence spending has intensified following direct pressure from Washington and from NATO Secretary General Mark Rutte, who has pushed all alliance members to move beyond the 2% floor. The government has indicated it wants to reach 2.5% by 2027, with 3.5% framed as a longer-term aspiration rather than a fixed deadline. But critics — including some within the defence establishment — say that ambiguity is itself a problem when adversaries are watching closely.

Defence analysts estimate that meaningful increases in military capability, including new shipbuilding contracts, expanded army recruitment, and updated air defence systems, would require sustained annual budget increases of between 8% and 12% in real terms over at least seven years.

What comes next

The row is unlikely to fade quickly. Parliamentary committees are expected to revisit defence funding assumptions in the autumn spending review, and Burnham is widely expected to use his platform to keep pushing back against what he’s called “unfunded bravado” from both parties.

Whether the government can produce a credible phased plan — one that satisfies NATO allies, placates nervous backbenchers, and survives contact with the Treasury — remains the central question hanging over British defence policy heading into 2026.