HC Deb 07 February 1968 vol 758 c140W
72. Mr. Barnes

asked the President of the Board of Trade what conclusions he has reached regarding the practicability of providing additional equipment at London Airport for monitoring the height of approaching aircraft.

Mr. J. P. W. Mallalieu:

The investigation of suitable equipment is continuing. There are a number of technical problems to solve and we shall also need to consider the cost in relation to the possible reduction in noise disturbance.