The Metropolitan Police Service (MPS) is the territorial police force responsible for law enforcement in Greater London, excluding the "square mile" of the City of London, which is the responsibility of the City of London Police.

The MPS also has significant national responsibilities, such as co-ordinating and leading on UK-wide national counter-terrorism matters, and the protection of the senior members of the British Royal Family, and also members of The Cabinet and other ministerial members of Her Majesty's Government.

ACT Strategic, ACT Operational, ACT Awareness, Document Fraud Awareness & See Check and Notify is delivered by Police Officers and Police Staff who are part of the Counter Terrorism Unit.