Whether his department purchased any houses for ministers and/or deputy ministers (a) in the 2009-10 financial year and (b) since 1 April 2010; if not, why not; if so, (i) for which ministers/deputy ministers, (ii) where is each house located, (iii) what was the purchase price for each house, (iv) what are the details of each house and (v) what are the reason for each purchase?