The UK defence sector has all the arguments, now it needs to make them
On 11 June 2026, John Healey resigned as Secretary of State for Defence. In his letter to the Prime Minister, he wrote that Keir Starmer had been “unable, and the Treasury has been unwilling, to commit the resources that the nation needs to defend the country at this time of rising threats.”
Armed forces minister Al Carns followed within hours, calling the Defence Investment Plan neither sufficiently funded nor transformative enough. Within a fortnight, Starmer himself had announced his resignation. The plan his caretaker government published this week is reported to be worth around £14.5 billion, against the £28 billion defence chiefs had asked for: 2.69 per cent of GDP in 2030, a hundredth of a percentage point above the trajectory Healey resigned over. Dan Jarvis takes that settlement into the Ankara NATO Summit on 7 and 8 July.
The deeper story is not the government’s fiscal difficulties. It is a structural problem the UK defence sector has never resolved: the absence of a sustained, credible public case for defence investment. When political will weakens, and it always does, there is nothing underneath. No reservoir of public belief. No settled understanding of why the spending matters. Just the void into which cuts fall.
The sector has seen this film before
The 2010 Strategic Defence and Security Review is the instructive episode. Facing a £38 billion unfunded liability in the defence budget, the coalition government made decisions defence insiders knew were wrong and the public accepted without objection. The Harrier fleet was retired and sold for spares. The £3.4 billion Nimrod MRA4 programme was scrapped with the first aircraft complete. The UK was left without a maritime patrol capability for a decade. Real-terms defence spending then fell 22 per cent between 2009 and 2016.
The SDSR was condemned by defence professionals and the Defence Select Committee alike, yet it was not politically costly. The public had no stake in the Harrier, no understanding of maritime patrol, no frame for evaluating what was lost. A Treasury-driven review dressed in strategic language went through because nobody had built belief in what was at stake. The sector rebuilt; the communications model that produced the catastrophe went unchanged.
The same conditions are back
Ipsos polling conducted in May 2026 found that only 37 per cent of British adults support increased defence spending if it means higher taxes or cuts to public services, down eleven points in two months. Fifty per cent oppose it if it means a rise in personal taxation. Support rebounded in June, which rather proves the point: belief that moves with the headlines has nothing durable underneath it. The one framing that reliably generates support is jobs and apprenticeships: a civilian economic argument, not a security one.
The UK has committed to spending 3.5 per cent of GDP on core defence by 2035 as part of the NATO framework agreed at The Hague. The Office for Budget Responsibility calculates that meeting this commitment would require an additional £40 billion per year. The gap between what is pledged at alliance level and what the Treasury will sanction is the predictable result of a security argument never made to the people who ultimately determine whether governments can sustain it.
The sector’s response has been consistent and consistently insufficient. BAE Systems, Babcock, Rolls-Royce Defence, QinetiQ and their trade bodies speak with fluency and force to the Ministry of Defence, the Defence Select Committee, the specialist press and the think tanks whose conclusions they already share. They have built no equivalent architecture for reaching the public environment in which their market ultimately lives or dies.
The messenger problem
Other contested industries have absorbed this lesson. Organisations that speak loudly in their own defence confirm their interest in the outcome; the more visible the contractor, the easier it is to attach motive to the message. Independent voices, with no financial stake, move public and parliamentary belief in ways no corporate channel can replicate. The defence sector has an acute version of the problem and has done almost nothing about it.
The UK adds a further layer. The public case for defence has been built on veterans’ welfare, the armed forces covenant and historical memory. These are important arguments, but they are not arguments for a sustained industrial investment programme running across multiple parliamentary terms. The emotional case and the strategic case are disconnected, and the sector has never bridged them.
The Healey resignation is the warning Jarvis inherits. One of the most committed advocates for the spending the sector needs could not hold the line against a Treasury facing no public counterweight to its instinct to cut. That is not a failure of individual will. It is the consequence of neglecting the environment in which political will is formed.
The sector enters the Ankara Summit next week weaker than it should be. The pipeline is fuller than in 2010, the industrial base larger, the strategic argument clearer than ever. None of it matters without the public belief infrastructure to sustain political commitment across electoral cycles. That infrastructure does not exist, and the sector is the only constituency with both the interest and the means to build it.
