The Specialist Crime Directorate (SCD) was one of the main branches of the London Metropolitan Police Service. It dealt with highly visible specialist policing services across the whole of London and provided highly visible specialist policing services across the whole of London. Assistant Commissioner Mark Rowley previously led the directorate but it's now led by Assistant Commissioner Cressida Dick. The Directorate led national police agency with regard to specialist crime investigations such as e-crime, sex crimes (paedophile unit) or kidnappings, hostage taking and contract killings.
The Specialist Crime Directorate has been merged with Central Operations to create Specialist Crime & Operations
It encompassed several departments:
References
Specialist Crime Directorate (Metropolitan Police) Wikipedia(Text) CC BY-SA