PDF - http://www.foi.gov.uk/guidance/disclosure_logs.pdf
"Many public authorities maintain what they call "disclosure logs" listing and providing access to previously made FOI requests, as the year progresses more will start to appear. They may be often part of the publication scheme. They are not mandated under the Act at present. "
Home Office Released Information - http://www.homeoffice.gov.uk/about-us/freedom-of-information/released-information/
Disclosure Logs Index / UK Freedom of Information Act Blog
http://foia.blogspot.com/log.htm