To ask the Secretary of State for Communities and Local Government pursuant to the answer of 9 May 2008, Official Report, column 1206W, on housing: migration, what research she has (a) commissioned and (b) evaluated on the proportion of projected household growth attributable to net migration in England; how many such projections have been made since 1987; and what her most recent projection is of the proportion of household growth attributable to net migration. (206253)