UK security services

In the United Kingdom, the umbrella term security services refers to the UK government agencies collectively responsible for espionage, counterespionage, counterterrorism and other covert activities.

This typically means:

• Security Service, more commonly known as MI5
• Secret Intelligence Service (SIS), more commonly known as MI6

Some people also count Special Branch and the Metropolitan Police Anti-Terrorist Branch as part of the security services.

British intelligence agencies Domestic intelligence Security Service/MI5 National Crime Agency (NCA) National Ballistics Intelligence Service (NBIS) National Domestic Extremism and Disorder Intelligence Unit (NDEDIU) National Fraud Intelligence Bureau (NFIB) Foreign intelligence Secret Intelligence Service (SIS)/MI6 Defence Intelligence (DI) Signals intelligence Government Communications Headquarters (GCHQ) Joint intelligence Joint Intelligence Organisation (JIO) Defunct intelligence agencies Directorate of Military Intelligence (DMI) Military Intelligence, Section 1 (MI1) Military Intelligence, Section 2 (MI2) Military Intelligence, Section 3 (MI3) Military Intelligence, Section 4 (MI4) Military Intelligence, Section 7 (MI7) Military Intelligence, Section 8 (MI8) Military Intelligence, Section 9 (MI9) Military Intelligence, Section 10 (MI10) Military Intelligence, Section 11 (MI11) Military Intelligence, Section 12 (MI12) Military Intelligence, Section 14 (MI14) Military Intelligence, Section 15 (MI15) Military Intelligence, Section 16 (MI16) Military Intelligence, Section 17 (MI17) Military Intelligence, Section 19 (MI19) Naval Intelligence Division (NID)