My Department has not issued any guidance on this issue.
The Information Commissioner's Office published updated guidance on 17 May 2007 which included advice to elected and prospective members of local authorities on how registration under the Data Protection Act 1998 applies to them. The guidance can be found on the Commissioner's website at
http://www.ico.gov.uk/upload/documents/library/data_protection/practical_application/advice_elected_and_prospective_members_local_authorities.pdf.