Serco Denholm is a joint venture between Serco Group and Denholm Group to provide Marine Services in support of the Naval Service at its three main naval bases, HMNB Portsmouth, HMNB Devonport and HMNB Clyde.
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However, Marine Services was put out to commercial tender by the Ministry of Defence Warship Support Agency (now part of the Defence Equipment and Support organisation) and since 1996 tugs, lifting craft, various tenders and management of HMNB Devonport, Portsmouth and Clyde have been operated and provided by Serco Denholm.
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In 1976, the former Port Auxiliary Service merged with the Royal Maritime Auxiliary Service to provide Marine Services to the United Kingdoms Naval Service.