The Cabinet Office, on an annual basis, publishes a report to Parliament on the performance of Departments in replying to Members/Peers correspondence. The report for 2005 was published on 30 March 2006, Official Report, columns 76-78WS.
The information requested is not recorded and could be obtained only at disproportionate cost, however it is of note that the Department has received a total of in excess of 15,000 letters from both hon. Members and members of the public over the past 12 months.