Secrets and spies: Behind the doors of the UK's most enigmatic government agency

Over a century GCHQ has evolved from a codebreaker into a critical defence against the most advanced technological threats to national security.
Read more: https://www.nationalgeographic.co.uk/history-and-civilisation/2020/10/secrets-and-spies-behind-the-doors-of-the-uks-most-enigmatic?source=Snapzu