Many thanks, above all, to Richard Riding, the former editor of Aeroplane Monthly  and author of “Ultralights - The Early British Classics”, from which we have plundered most of the aviation techical data and history.  We have used photographs from those publications. Also, thank you to Group Captain Peter Dye, director, Collections Division of the RAF Museum Cosford, Air Vice Marshall Sir Roger Austin,  the late Peter Richardson and to Flight Magazine.

Family archives, including material from Naomi Perry and Adrian Comper, have been the primary source.