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MI5 (Military Intelligence, Section 5), [2] officially the Security Service, is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (MI6), Government Communications Headquarters (GCHQ), and Defence Intelligence (DI).
The Single Intelligence Account (SIA) is the funding vehicle for the three main security and intelligence agencies: the Secret Intelligence Service (SIS/MI6), [44] Government Communications Headquarters (GCHQ) [45] and the Security Service (MI5). [46] Spending on the SIA was £3.6 billion in financial year 2022/23. [47]
The Director of JTAC reports to the Director General of the Security Service (commonly known as MI5), and directs a staff including personnel from the Security Service, Secret Intelligence Service (commonly known as MI6), Government Communications Headquarters (GCHQ), Defence Intelligence Staff, Counter Terrorism Policing and a further six government departments.
The Joint Threat Research Intelligence Group (JTRIG) is a unit of the Government Communications Headquarters (GCHQ), the British intelligence agency. [1] The existence of JTRIG was revealed as part of the global surveillance disclosures in documents leaked by the former National Security Agency contractor Edward Snowden .
The moves of MI5 and the Secret Intelligence Service (SIS) to new buildings had also cost more than three times their original estimates due to issues with transferring computers. [15] HM Treasury paid £216 million toward a newly agreed budget of £308 million, having initially refused to finance the original high figure. [13]
Major General Sir Vernon George Waldegrave Kell, KBE, CB (21 November 1873 – 27 March 1942) was a British Army general and the founder and first Director of the British Security Service, otherwise known as MI5. Known as K, he was described in Who's Who as "Commandant, War Department Constabulary". [1]
MI6 is included as an alias on the Secret Intelligence Service website, though the official abbreviation, SIS, is predominant. While the names remain, the agencies are now responsible to different departments of state, MI5 to the Home Office, and MI6 the Foreign Office.
The Joint Intelligence Organisation is a British intelligence agency responsible for intelligence assessment and development of the UK intelligence community's analytical capability. [1] It is headed by a Permanent Secretary-level civil servant.