The National Archives' draft guidance on handling information requests relating to deposited public records

"The National Archives (TNA), in partnership with other government bodies
and places of deposit for public records, has been developing procedures,
forms and guidelines to promote and support this aim. This work is being
led by staff in TNA's Archive Inspection Services Unit.

Draft procedures for use by places of deposit in dealing with FOI requests
about their deposited public records holdings have now been prepared, and
are available here as a pdf document:"

http://www.nationalarchives.gov.uk/news/stories/30.htm