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.

Provides information on the current major threats to UK security and expert security advice designed to help businesses and organisations protect against them.

Describes MI6, a Crown Service responsible for obtaining secret information and conducting operations in support of the UK’s foreign policy objectives, and to counter threats to UK interests worldwide.

Hyperlinked encyclopedia article about MI6 (Her Majesty's Secret Service) provides a history of its role beginning with the First World War. With list of directors.

Hyperlinked encyclopedia entry provides the history of the Security Service, responsible for protecting British Parliamentary democracy and economic interests, and fighting serious crime.

Provides a brief history and a list of responsibilities, including intelligence-gathering and operations on extremist political and terrorist activity.

Official report describes the roles and functions of this intelligence and policing service at national, regional and local levels.

Official independent tribunal investigating complaints against the Intelligence Services, Police and public authorities relating to interception, surveillance and other conduct.

Offers news, list of committee members, and links to annual reports and other official publications.

Official document explaining how British security and intelligence agencies are organised and funded.

Official site of this government department also known as MI6. Features background information, contact details and career opportunities.