http://www.acpo.police.uk/asp/policies/Data/Core%20Investigative%20Doctrine.pdf
Produced on behalf of the Association of Chief Police Officers
by the National Centre for Policing Excellence
"The performance of the police in the area of investigation is continually under scrutiny by the government, the criminal justice system and the media. There is widespread recognition within the Police Service that there is a need to improve the professionalism of the investigative response."
