Official site of the UK Government Communications Headquarters which is the centre for Her Majesty's Government's Signal Intelligence (SIGINT) activities. Includes details of current job vacancies and an online quiz for potential applicants.
http://www.gchq.gov.uk/
The Security Service (commonly called MI5) carries out security intelligence work aimed at combating threats to the nation such as espionage and terrorism.
http://www.mi5.gov.uk/
The National Criminal Intelligence Service (NCIS) is at the forefront of the fight against serious and organised crime in the UK and throughout the world.
http://www.ncis.co.uk/
Provides information about the roles and responsibilities of those who authorise and conduct covert surveillance operations and covert human intelligence sources.
http://www.surveillancecommissioners.gov.uk/
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