Commissioned by the National Physical Laboratory (NPL), as part of the Maritime Autonomy Assurance Testbed (MAAT) programme, in partnership with the National Shipbuilding Office (NSO), this report, developed by Stehr Consulting Ltd, seeks to provide an evidence‑based assessment of the scale, structure, and economic potential of the UK Maritime Autonomy market across commercial and defence applications. It establishes a clear and consistent definition of Maritime Autonomy, quantifies current and future economic impacts, and identifies the key drivers, opportunities, and constraints shaping market development. Designed to contribute a shared, authoritative evidence base, the study supports informed decision‑making across government, industry, and the investment community, providing a practical foundation for policy, investment, and strategic planning in a rapidly evolving sector.