Autumn 1939: GC&CS moves to Bletchley Park to avoid wartime bombing. The move to Bletchley may also have resulted in the first usage of the term "Government Communications Headquarters" or GCHQ. Some have suggested that the term was initially used as a cover name when endless lorries were dropping off loads at the newly established site in late 1939. Used intermittently through the war, the term "GCHQ" did not become mainstream until 1948.
Bletchley Park is near Milton Keynes and is one of Britain's most exciting museums.
If you are too far away to visit you can take the superb Bletchley Park tour -