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Figures on crime in London are based primarily on two sets of statistics: the Crime Survey for England and Wales (CSEW) and police recorded crime data. Greater London is generally served by three police forces; the Metropolitan Police which is responsible for policing the vast majority of the capital, the City of London Police which is responsible for The Square Mile of the City of London and the British Transport Police, which polices the national rail network and the London Underground. A fourth police force in London, the Ministry of Defence Police, do not generally become involved with policing the general public. London also has a number of small constabularies for policing parks. Within the Home Office crime statistic publications, Greater London is referred to as the London Region.
