Where is the base of one of the three main British intelligence agencies?
British intelligence agencies: The Government of the United Kingdom maintains intelligence agencies within several different government departments. British intelligence agencies:  The three main agencies are the Secret Intelligence Service (MI6), the Security Service (MI5), and the Government Communications Headquarters (GCHQ). Government Communications Headquarters: The Government Communications Headquarters (GCHQ) is an intelligence and security organisation responsible for providing signals intelligence (SIGINT) and information assurance to the government and armed forces of the United Kingdom.
i don't know