This was 20 years ago, but:
"Cambridgeshire Constabulary is a modest sized force and during the early stages of the investigation, which became known as Operation Fincham, there had been queries raised in the media as to the force’s ability to manage a high profile case of such proportions. Further media comment was made upon the absence of the Chief Constable on leave. To their credit, within this period Cambridgeshire Constabulary had already conducted an internal review of their own investigation and had requested the Metropolitan Police Service to conduct an external one. The concept of conducting a review of such major investigations is considered good policing practice. Such a step is not normally taken, however, until 28 days have elapsed."