I was surprised by the use of the term Naval Service.
From wiki.
The Naval Service is the naval warfare and maritime organisational structure of the British Armed Forces. It consists of the Royal Navy, Royal Marines, Queen Alexandra's Royal Naval Nursing Service, Maritime Reserves, and the Naval Careers Service.[1]
The term Naval Service should be distinguished from the "UK Naval Services", which consist of the Naval Service and the Merchant Navy. The Naval Service as a whole falls under the command of the Navy Board, which is headed by the First Sea Lord. This position is currently held by Admiral Sir George Zambellas (appointed April 2013).[2] The Defence Council delegates administration of the Naval Service to the Admiralty Board, chaired by the Secretary of State for Defence.
I check the source for 1. "Queen's Regulations for the Royal Navy"