Starmer Considers Scaling Back Defence Spending Plans Amid Mounting Fiscal Pressures

Prime Minister Keir Starmer and former Defence Secretary John Healey. Photographer: Simon Dawson UK © Crown copyright 2026

Sir Keir Starmer is reportedly considering scaling back a long-awaited defence spending plan amid growing concerns within Government over the state of the public finances.

The Prime Minister and Chancellor Rachel Reeves had been expected to commit around £18 billion to defence investment over the next four years. However, reports suggest ministers are now examining whether the package could be reduced to £15 billion, raising fresh questions about Labour’s ability to deliver on its promises to the Armed Forces.

According to reports, Sir Keir and Ms Reeves held further discussions this week about the Defence Investment Plan (DIP) as concerns intensify over Britain’s economic outlook. While the conflict involving Iran has added pressure through higher energy costs and disruption to global trade routes, critics argue that Labour’s broader economic decisions have left the Government with limited room for manoeuvre.

The Prime Minister has warned that continued disruption in the Strait of Hormuz could further damage Britain’s finances. However, opponents point out that the country’s fiscal challenges pre-date the latest international crisis and stem from wider concerns about economic growth, public spending commitments and Government borrowing.

The uncertainty surrounding defence funding comes as Sir Keir faces increasing scrutiny over his commitment to military spending. Despite pledging to increase defence expenditure to 3 per cent of GDP, he has repeatedly declined to provide a timetable for achieving that target.

Speaking to Times Radio on Thursday, Chief Secretary to the Treasury Lucy Rigby declined to confirm whether the full £18 billion originally expected for the Defence Investment Plan would be delivered.

“I can confirm that we will be spending more money on defence,” she said.

Pressed on whether the £18 billion commitment remained intact, Ms Rigby refused to provide figures, saying only that the plan would be published “soon”.

The Defence Investment Plan is expected to outline how Britain will fund and equip its Armed Forces over the next decade. It was originally scheduled for publication in autumn last year but has been repeatedly delayed amid ongoing disagreements between the Treasury and the Ministry of Defence.

Defence Secretary John Healey has also declined to confirm whether the Treasury has approved the final plan, although he insisted the Government remains determined to publish it before next month’s NATO defence ministers’ summit in Germany.

The delays have fuelled criticism from defence experts and political opponents, who argue that Labour has failed to provide clarity at a time of growing international instability. Concerns have also been raised that even the previously expected £18 billion increase would fall significantly short of what military planners believe is required.

Analysts have suggested that the Armed Forces face a funding gap of around £28 billion over the next four years, meaning that any reduction in the proposed investment package could intensify pressure on defence budgets.

The debate comes against a difficult political backdrop for the Prime Minister. Labour continues to face internal divisions following poor local election results, while some MPs have called for greater clarity about the party’s future direction.

Questions over defence spending are likely to remain a major test of Sir Keir’s leadership as ministers attempt to balance military commitments with growing pressure on the public finances.

While the Government has cited global instability and rising energy costs as factors affecting its spending plans, critics argue that Labour’s own economic choices have contributed significantly to the current fiscal constraints, leaving ministers struggling to fund key pledges made since entering office.

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