The UK’s parliamentary spending watchdog has issued a sharp rebuke over delays to the government’s Defence Investment Plan (DIP), warning that the absence of a long-term strategy is undermining national credibility. The report from the Public Accounts Committee (PAC) argues that current procurement hold-ups are driving up costs and hindering efforts to modernize the Armed Forces for the modern battlefield.
Why the Defence Investment Plan remains in limbo
The Public Accounts Committee, which holds the government to account on public spending, contends that the nation has effectively gone years without a credible plan for military capability. While the Defence Investment Plan was originally slated for an autumn release, it is now expected to arrive just ahead of a Nato summit early next month.
According to the PAC report, the delay stems from the Ministry of Defence’s (MoD) inability to settle on the specific capabilities, infrastructure, and personnel required to transform the military into a warfighting-ready force. Sir Geoffrey Clifton-Brown, chair of the committee, dismissed internal government justifications for the delay.
Those responsible may argue there are good reasons for the DIP’s continuing absence, but our report makes clear that excuses to the effect of ‘taking the time to get the details right’ simply do not cut it.
Sir Geoffrey Clifton-Brown MP, Chair of the Public Accounts Committee
Defence Secretary John Healey informed the Commons on Monday that the government remains determined to publish the document, which is intended to follow the Strategic Defence Review released on 2 June 2025. The delay has placed the Ministry of Defence in a difficult position regarding parliamentary oversight, as the committee noted in its findings that the lack of a clear timeline for the DIP prevents MPs from scrutinizing the financial viability of long-term military commitments. The committee’s inquiry specifically examined how the absence of this plan complicates the MoD’s ability to communicate its priorities to industrial partners, many of whom require multi-year visibility to maintain production lines for critical munitions and platforms.
Escalating costs and procurement friction
The committee warns that the uncertainty surrounding the DIP is not merely an administrative failure but a financial one. As global instability drives up prices among defence contractors, the lack of a clear investment roadmap forces the MoD into a reactive position, making the procurement of essential modern equipment significantly more expensive. The PAC highlighted that inflation within the defence sector, coupled with supply chain volatility, has created a “vicious cycle” where delayed decisions lead to cost overruns that further erode the department’s purchasing power.
The Ministry of Defence has defended its track record since taking office in July 2024, noting that it has already signed more than 1,400 major defence contracts. A spokesperson stated that the department is working to “fix the outdated, overcommitted and underfunded programme we inherited” and is committed to “a generational increase in defence spending… ensuring no return to the hollowed out armed forces of the past.” However, the PAC report counters this by citing specific examples where the lack of an overarching plan has led to fragmented procurement cycles. In their testimony, representatives from the MoD’s procurement arm acknowledged that without the DIP, they are operating on an annual budget basis, which hinders their ability to negotiate long-term, fixed-price contracts that could shield the department from market fluctuations.
Ongoing struggles with the Ajax vehicle programme
Beyond the broader investment strategy, the PAC report highlights persistent technical and welfare concerns regarding the Ajax armoured vehicle programme. In November 2025, the army was forced to pause the use of the vehicles after soldiers reported suffering from noise and vibration issues, including cases of vomiting.
- Affected Personnel: 33 soldiers were impacted by the vehicle issues.
- Medical Status: As of March, five soldiers remained under medical review.
- Operational Burden: The MoD now requires maintenance checks after every stop, a mandate the committee labeled “unreasonable” for long-duration combat operations.
The report expresses skepticism regarding the future of the platform, noting that an “Ajax 2” upgrade package is currently in development at an unknown cost. The committee stated that it awaits the outcome of these upgrades “more in hope than expectation.” Currently, the Ajax vehicles in use are restricted to trial purposes only, as the government works to restore confidence in the fleet before full deployment. The committee’s investigation into the Ajax programme also revealed that the MoD had failed to adequately monitor the health impacts on crew members for several months following the initial reports of vibration-induced injury. In their formal response to the committee, the MoD indicated that they have implemented new noise-cancelling technologies and seating modifications, but the PAC remains concerned that the platform’s fundamental design issues may not be fully resolved by these iterative adjustments.
The stakes for the upcoming Nato summit
The pressure to release the DIP is intensified by the approaching Nato summit. The MoD’s inability to present a cohesive plan for military transformation has left the UK vulnerable to criticism regarding its commitment to equipping a “warfighting-ready” force. With the government promising a generational shift in spending, the upcoming release will serve as the primary indicator of whether the MoD can transition from managing legacy programmes to executing a coherent, modern strategy.
International observers and Nato allies have reportedly expressed concerns through diplomatic channels about the UK’s procurement pace, particularly regarding the ability to surge production of artillery and air-defence systems. The PAC report emphasizes that the DIP is not just a domestic policy document but a signal to international partners of the UK’s long-term industrial capacity. By failing to publish the document, the committee argues that the government is inadvertently signaling a lack of strategic clarity at a time when the Nato alliance is increasingly focused on hardening its eastern flank. The Ministry of Defence has stated that the forthcoming plan will align with the June 2025 Strategic Defence Review, but the PAC notes that without a specific, costed roadmap, the government’s stated goals for “technological superiority” remain aspirational rather than actionable. As the summit approaches, the committee has demanded that the Secretary of State provide a detailed timeline for the DIP’s publication and a breakdown of how the proposed spending increases will be ring-fenced to prevent the same procurement failures seen in previous decades.
