The direction of travel is right. The architecture is wrong.
The Strategic Defence Review 2025 diagnosed the United Kingdom's defence posture correctly and promised reform at "wartime pace." Ten months after its publication, the Defence Investment Plan remains unpublished, procurement reform has generated activity but little structural change, and the country's sole success at Ukrainian-pace delivery — Project ASGARD — remains a boutique exception rather than a new operating model. This briefing argues that the declared direction of travel is right but the architecture being built to deliver it is wrong, and that beginning to construct the correct architecture is tractable, affordable, and urgent.
Key facts for Members
- Ukrainian drone interceptors cost £1,500–£4,000 per unit and reportedly destroy up to 90% of Russian Shahed attacks. A Patriot interceptor costs £3 million; an AIM-9X Sidewinder costs £400,000.
- The Defence Investment Plan, scheduled for autumn 2025 publication, remained unpublished as of mid-December 2025 per the Royal Aeronautical Society.
- UK Defence Innovation's envelope is £400 million; this is roughly one-tenth of the scale required to instantiate a Ukrainian-pattern cluster.
- Ukrainian defence-technology startups raised $105 million in 2025, up from $5 million in 2023 — a twentyfold increase.
- At least one NATO country is in active negotiations to purchase the Ukrainian DELTA battlespace management system under intergovernmental agreement.
- Between January and July 2025, the Ukrainian Defence Procurement Agency supplied more than one million FPV drones to front-line units. By end-2025, over three million strike drones had been delivered through all channels.
- The total five-year architectural cost proposed in this paper (£2.5–3.5 billion) fits within the existing Review funding envelope and does not require new money.
Each principle has a British institutional analogue, and most of those analogues already partially exist. The missing step is political composition.
This briefing sets out what the Review has and has not achieved; what Ukraine has actually built and why it matters; the five principles that transfer; the UK-specific obstacles to adoption (Treasury risk culture, civil service incentives, prime-contractor dependencies, parliamentary oversight expectations); a concrete implementation architecture using existing institutional homes; a First Hundred Days plan for both government and Parliament; and an honest risk analysis in both directions. It closes with recommendations to ministers and Annex C, a set of suggested Parliamentary Questions and committee lines of inquiry for Members who wish to press the issue.
The argument of this paper is cross-party. The position described does not favour one political tradition over another. It has been reached by Labour, Conservative, and Liberal Democrat analysts in approximately the same form, and the architectural choice required can be made by any government with the will to make it. The political question is timing.