Read this: Policing in Greater London, with the exception of the City of London, is provided by the Metropolitan Police Service, overseen by the Mayor through the Mayor's Office for Policing and Crime (MOPAC). The City of London has its own police force – the City of London Police. The British Transport Police are responsible for police services on National Rail, London Underground, Docklands Light Railway and Tramlink services. A fourth police force in London, the Ministry of Defence Police, do not generally become involved with policing the general public.

Which police force in London does not typically engage in police activity with the general public?
What is the answer? (If it cannot be answered, return "unanswerable")
the Ministry of Defence Police