I refer the hon. Member to the answer given to the hon. Member for North Cornwall (Mr. Rogerson) on 25 July 2006, Official Report, column 1604W.
Data on empty homes for registered social landlords (RSLs) are collected on the Regulatory and Statistical Return of the Housing Corporation (Long form) which is completed by those RSLs which have 250 or more dwellings and bedspaces.
Information on vacant general needs vacant dwellings is published on the Department for Communities and Local Government website on Table 613. The web link is: http://www.communities.gov.uk/pub/26/Table613_idll56026.xls