asked the Secretary of State for the Environment what estimate he has of the extra cost of an average dwellinghouse which will be due to the provisions of section F3 of the Building (Second Amendment) Regulations 1974 (S.I., 1974, No. 1944); and how this estimate is calculated.
I would refer my hon. Friend to the reply I made to the right hon. and learned Member for Hertfordshire, East (Sir D. Walker-Smith) on Tuesday, 19th December.—[Vol. 883, c. 600–1.]