As I stated in reply to my hon. Friend the Member for St. Pancras North (Mr. Grant-Ferris) on 28th April, a opy of which I am sending to my hon. Friend, I do not think that sufficient experience has been gained to justify pronouncing in favour of any particular device. In these circumstances I think it would be agreed that it would not be right for me to take the initiative in suggesting to Imperial Airways the adoption of the Goodrich de-icer in preference to the system with which they are experimenting.