Risk and retention: learning from Heathrow Terminal 5 for defence procurement

Defence procurement of complex systems is usually discussed as problems of cost growth, delay, and weak commercial discipline. This article argues that the deeper problem is the gap between retained and governable risk. The article uses Heathrow Terminal 5 and Project 13; an infrastructure enterprise-delivery model, as prompts rather than templates. It develops Ajax as the main defence case and the Queen Elizabeth-class aircraft carriers as a secondary strategic-lock-in case. The contribution is a defence capability owner framework that Defence Equipment and Support (DE&S) can use as a diagnostic tool before commitment, during delivery and after programme review. The framework places learning capability at the centre because long-duration defence programmes repeatedly convert weak continuity, poor issue escalation, and thin institutional memory into ungovernable retained risk. The article contributes to the strong-owner and defence-procurement literatures by making the retained/ governable distinction operational, translating it into a five- capability diagnostic usable by DE&S.