History of the Metropolitan Police Service been headed by a Commissioner, rather than a Chief Constable which is the highest rank in police forces outside London. The first Commissioners to hold the post were Lieutenant-Colonel Sir Charles Rowan and Sir Richard Mayne. When Sir Charles Rowan died, leaving Sir Richard Mayne as the surviving Commissioner, Captain William Hay was drafted in to jointly run the force with Mayne. However, because the two Commissioners did not agree on methods of running the force, since 1855 it was decided that only one Commissioner would run the force. Metropolitan Police patrols took to the streets on 29 September 1829,
Organisation and structure of the Metropolitan Police Service formed in order to deliver a single, joined up intelligence service to the Metropolitan Police Service. The service is uniformly professionalised and the command owns all the Metropolitan Police Service intelligence professionals, including those who work in covert policing. Specialist Operations (SO) is a directorate of the Metropolitan Police Service, responsible for providing specialist policing capabilities. Until Sir Kenneth Newman's restructuring of the Metropolitan Police, SO comprised twenty units, but after the restructuring most of them were absorbed by Central Operations (now Specialist Crime and Operations). SO is currently headed by an Assistant Commissioner, with two Deputy Assistant Commissioners and