The Security Service (MI5) is responsible for protecting the United Kingdom against threats to national security. This website provides information about the Security Service, the threats it counters, links to sources of security advice and details of careers with the Service.
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February 2014 release of files by The National Archives
28 February 2014
The National Archives has released 110 more historical files from the Security Service....
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Director General Andrew
Parker gives evidence
to intelligence committee
