The following is from the House of Commons Hansard for 5th June 2006:
Mrs. Curtis-Thomas: To ask the Secretary of State for the Home Department when he last reviewed the code of practice for scene of crime officers. 
Joan Ryan: The Home Office has not issued a code of practice for scene of crime officers and, as far as we are aware, there is no national code of practice as such. However, both the Forensic Science Service and the Association of Chief Police Officers have issued some good practice guidance for scenes of crime staff. This
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includes: The Scenes of Crime Handbook, the National Operational Standards for Scenes of Crime and a draft National Crime Scene Investigation Manual.