To ask the Secretary of State for Defence pursuant to the answer of 23 February 2009, Official Report, column 20W, on armed forces: housing, if he will make an assessment of the reasons for the changes in numbers of houses at grade (a) one and (b) four for charge between 2005 and 2007. (264226)

Given the way Grade for Charge data are collated officials need to identify and analyse information to answer this question. I will write to the hon. Member when this work is complete and place a copy of my letter in the Library of the House.