Joint Procurement and Shared Stockpiling Could Create £3.4 Billion in Fiscal Headroom for UK Defence, IPPR Finds

Homeland August 6, 2026

JEF defence ministers set direction for cooperation on northern European security

New analysis from the Institute for Public Policy Research makes the economic case for deeper allied defence cooperation – and warns that without expanding industrial capacity, higher spending risks feeding defence inflation rather than maximising capability.

Stockpiling weapons and ammunition with European allies and combining procurement orders could create up to £3.4 billion in fiscal savings and additional headroom under the government’s Defence Investment Plan, according to new analysis from the Institute for Public Policy Research. The findings reframe the debate around UK defence funding at a moment when ministers are weighing the considerably larger challenge of reaching 3% of GDP by 2030 – a target the IPPR estimates would require approximately £13 billion of additional annual spending in today’s prices.

The IPPR’s analysis identifies two specific mechanisms through which allied cooperation could ease the fiscal pressure on the current DIP. Joint procurement – combining orders with European partners and reducing duplication – could cut equipment costs by around £0.9 billion, with coordinated purchasing potentially reducing unit costs by up to 20%. The scale of the opportunity is illustrated starkly by the comparison between European and American procurement fragmentation: Europe currently operates around 178 major weapons systems against approximately 30 in the United States. Consolidation even a fraction of the way towards the US model would generate material savings. Holding part of Britain’s munitions stockpile through a multinational institution could defer approximately £2.5 billion of borrowing under the government’s fiscal rules, creating additional headroom without requiring new spending commitments.

The IPPR is careful to frame what cooperation can and cannot achieve. The current DIP is only £0.9 billion underfunded in 2029/30 – the year the government’s fiscal rules bind – making it, in the think tank’s assessment, a rounding error against headroom of more than £20 billion. Cooperation could close that gap several times over. But reaching 3% of GDP by 2030 is an altogether different order of challenge, and the IPPR is explicit that joint procurement and shared stockpiling could make the increase more manageable without making it free. The government will still face difficult long-term decisions about tax, spending and borrowing.

The industrial dimension of the analysis is arguably its most significant contribution to the supply chain debate. The IPPR warns directly that higher spending risks feeding defence inflation rather than maximising capability unless Europe – including the UK – also expands the industrial capacity needed to produce weapons and ammunition. The cost of standard ammunition has risen between 300% and 600% since 2021, eroding a substantial portion of the value of recent spending increases. More money flowing into a constrained industrial base pushes prices up rather than capability up – a dynamic that the government’s energetics manufacturing programme, munitions investment and SME Action Plan are all designed to address, but which requires time and sustained investment to resolve.

To address both the financing and industrial capacity challenges simultaneously, the IPPR is urging the government to expand the Multilateral Defence Mechanism to enable joint equipment purchase and shared stockpiling, seek founding membership of the proposed Defence, Security and Resilience Bank – ideally combined with the Multilateral Defence Mechanism in a single vehicle – and publish a credible long-term funding plan for permanently higher defence spending. The proposed defence bank is particularly significant for smaller businesses: with every £1 of paid-in capital supporting between £5 and £8 of lending, founding membership would give British defence firms – particularly SMEs – access to affordable investment at a scale that domestic financing alone has not been able to provide.

Senior economist William Ellis described the optimal outcome as bringing the UK’s plans and the Canada-led defence bank together under one roof spanning Britain, Europe and Canada, warning that the UK will get less for its money if it continues buying alone. Associate Director Laura Chappell framed the allied cooperation argument in strategic as well as economic terms, noting that planning, procuring and building defence industrial capability with non-US partners supports the strategic shift away from reliance on uncertain US security guarantees – a consideration that has moved from the margins to the centre of allied defence planning in the current geopolitical environment.

For the UK defence supply chain

The IPPR’s analysis has direct and practical implications for UK defence suppliers. The warning that higher spending risks feeding inflation rather than capability unless industrial capacity expands is a clear statement of the structural challenge the supply chain faces – and the strongest possible argument for the government’s parallel investments in energetics manufacturing, skills development, SME access and procurement reform. For businesses considering investment in defence capacity, the analysis reinforces the case for acting now: the demand signal is real and growing, and the businesses that build capacity ahead of peak demand will be better positioned than those that wait for contracts before investing. The prospect of a multinational defence bank with lending leverage of five to eight times paid-in capital also points to a new and potentially significant source of investment finance for defence SMEs and mid-tier businesses looking to scale.

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