asked the Minister of Public Building and Works what estimate he has made of the cost of cleaning, by the new method already used on Admiralty House, of the other Government offices in Whitehall and the Houses of Parliament, respectively.

As I said in my Answer on 20th June, we are considering extending the new methods of cleaning to other Government buildings in Whitehall. Dover House and 36 Whitehall are possible candidates, but plans are still at a very early stage and realistic estimates are not yet available.There are at present no plans for cleaning the outside of the Palace of Westminster.