The information requested is as follows:
(a) The Cabinet Office, on an annual basis, publishes a report to Parliament on the performance of departments in replying to Members-Peers-correspondence. Information relating to 2008 will be published as soon as it has been collated. The report for 2007 was published on 20 March 2008, Official Report, columns 71-74WS. Reports for earlier years are available in the Library of the House.
(b) In respect of emails, this information is not centrally held and is not possible to collect within the disproportionate cost limit.