The Central Communications Command (CCC, also known as Metcall) is the largest Operational Command Unit OCU of London's Metropolitan Police Service. It sits within Territorial Policing, the business group within the Met that is responsible for Borough Policing and public contact. It is responsible for receiving emergency and non-emergency public telephony within the Metropolitan Police and between the police and the public & other forces, taking over from a number of smaller communications rooms scattered throughout the service. The "C3i programme", intended to modernise command and control and combine the MPS's communications into a single department was led by Sir Ian Blair prior to his promotion to Commissioner; the transition to the new system began in 2004 and was completed in December 2007. The OCU was intended to be known as "Metcall", selected by an internal staff competition, but this name is the registered property of the UK Meteorological Office. There are three main command-and-control at Hendon, Bow and Lambeth.
Historically, each of the Met's Borough Operational Command Units (BOCUs) had its own control room, known internally as the 'CAD Room' (for Computer Assisted Despatch) which dealt with incoming non-emergency telephone calls and with despatching police officers to all calls in that area. In addition Information Room at New Scotland Yard received 999 calls which were sent to the CAD Room to be dealt with. In 2004 staff began to migrate on a borough-by-borough basis to Metcall, with Southwark being the first BOCU to move.
Led by DAC Ron McPherson and Dr Amanat Hussain, the C3i programme (Communication, Command, Control & Information) was the largest police transformation programme undertaken in the UK. Working with Chief Superintendent Stephen MacDonald, the Operational Command Unit (OCU) Commander for CCC, the C3i programme modernised the command and control infrastructure to create seamless communications service for the Metropolitan Police Service to give the people of London a robust and resilient response policing service, getting the right people in the right place at the right time with the right information. The C3i Programme delivered optimised end to end Command and Control processes, new operational command unit (Central Communications Command), new Casualty Bureau Facility, largest Special Operations Room, Integrated Borough Operations Rooms and Telephone Investigation Bureaus services.