HC Deb 03 July 1973 vol 859 c81W
Q11. Mr. Jessel

asked the Prime Minister if he is satisfied with the co-ordination between the Department of Trade and Industry, the Department of the Environment, and the Department of Social Services, regarding the use made of the Noise and Number Index for measuring aircraft noise nuisance.

The Prime Minister

Yes. The Departments have co-operated closely in the use of this index and in considering whether it can be improved.