§ 38. Mr. Spriggsasked the Secretary of State for the Environment to what extent his Department has examined the real heat retention value of double glazing of housing, shops, industrial and commercial premises, &c.; and if he will make a statement.
§ Mr. KaufmanThe extent to which double glazing reduces heat loss has been known for a number of years as a result of work done by the Building Research Establishment and the industry.