Police use of dead children's identities 'common' 17 May 2013 Last updated at 13:26 The use of dead children's identities by Scotland Yard's Special Demonstrations Squad was "common practice," MPs have been told. Derbyshire Chief Constable Mick Creedon updated MPs on Operation Herne, which is looking at the Met's undercover operations. Claims about the use of the identities relate to the squad's operations in the 1980s. Mr Creedon was appointed in February.