HC Deb 20 January 1971 vol 809 cc279-80W
Mr. Pardoe

asked the Minister of Aviation Supply what investigations he has made of the long-term effect of supersonic aircraft on the upper atmosphere.

Mr. David Price

I would refer the hon. Member to my right hon. Friend's reply to the Question on this subject from the hon. Member for Fife, West (Mr. William Hamilton) on 18th November, 1970.—[Vol. 806, c. 400.]