1950s onwards
GCHQ left Bletchley Park in 1946 and after a short spell in the London suburbs moved to Cheltenham
The Axis Powers were replaced by the Warsaw Pact, but the partnership with American and Commonwealth partners endured and GCHQ retained its technological focus, adapting its capabilities to an ever more complicated telecommunications environment. The end of the Cold War and the transformational change caused by the internet, alongside major new requirements for intelligence and security, have created a GCHQ fit for the new challenges of today and tomorrow.