This report assesses the extent of changes within the security landscape and architecture of criminal investigations in the UK. It examines academic studies from the last forty years, media reports, interviews with those directly involved in the private security sector (PSS) and reports completed by state agencies responsible for inspecting and reviewing state governed Law Enforcement Agencies (LEA). It concludes that changes within criminal investigations have occurred and that the police and other LEAs are effectively pushing investigations into the domain of the PSS. The PSS are increasingly investigating crime traditionally the preserve of the police and LEAs, however, this is not occurring within a formalised setting. The change has not been recognised by those regulating and inspecting law enforcement nor is it being accepted by the police or other LEAs.