A Consultation paper: Transposition of Directive 2006/24/EC / Home Office, August 2008
PDF - http://www.homeoffice.gov.uk/documents/cons-2008-transposition?view=Binary
"Final phase of the transposition of Directive 2006/24/EC on the retention of data generated or processed in connection with the provision of publicly available electronic communications services or of public communications networks and amending Directive 2002/58/EC."