Admiralty
It evolved from *Admiralty Navy War Council, (1909–1912) which in turn became the Admiralty War Staff, (1912–1917) before finally becoming the Admiralty Naval Staff in 1917. It was the former senior command, operational planning, policy and strategy department within the British Admiralty. It was established in 1917 and existed until 1964 when the department of the Admiralty was abolished, and the staff departments function continued within the Navy Department of the Ministry of Defence until 1971 when its functions became part of the new Naval Staff, Navy Department of the Ministry of Defence.
Naval Intelligence Department (Royal Navy)
The Naval Intelligence Department (NID) was the intelligence arm of the British Admiralty from 1887 until 1912 when most of its subsidiary divisions were absorbed during the creation of the Admiralty War Staff department that included a new Naval Intelligence Division that concentrated in that sphere solely . It dealt with intelligence matters concerning British naval plans, and with the collection of naval intelligence in regard to coastal defences, foreign powers, mobilistation, trade and war.