Great Britain. Government Communications Headquarters (1948- )

found: Bamford, J. The puzzle palace, c1982:t.p. (GCHQ) p. viii, etc. (Government Communications Headquarters)

found: Government Communications Headquarters website viewed August 25, 2023:our-origins-and-wwi (Within a year of the end of the war, the separate naval and military intelligence organisations had merged to become the Government Code and Cypher School (GC&CS); officially came into being on 1 November 1919; GC&CS moved to Bletchley Park and began to call itself GCHQ; GCHQ left Bletchley Park in 1946 and after a short spell in the London suburbs moved to Cheltenham) - https://www.gchq.gov.uk/section/history/

found: GCHQ, 2010:Note on termanology (Government Communications Headquarters, or 'GCHQ', is a term of uncertain origin; Originally developed as a cover name for Bletchley Park in late 1939, it competed for usage with other designations, including 'BP', 'Station X' and indeed 'GC&CS'; the Government Code and Cypher School remained the formal title of the whole organisation in wartime; During 1946, GC&CS re-designated itself the 'London Signals Intelligence Centre' when the staff of Bletchley Park decamped to a new site at Eastcote near Uxbridge, although GCHQ remained in widespread use as a cover name; On 1 November 1948, as Britain's code-breakers began to investigate a further move away from London to Cheltenham, the term GCHQ was formally adopted and has remained in use ever since)