presentation to Hawker Association on July 14th 2021 at the invitation of Colin Wilson, President There were 33 attendees including John Tritton invited by Neville Lyons. John Tritton subsequently writes “Dear Neville, Your presentation was most interesting and informative, and so well researched. I’m glad that it was recorded so that I can watch it again, or recommend to friends. The same applies to your talk on LEO itself.I bought a copy of Peter Bird’s book from the man himself when he gave a talk some thirty years ago. I must read it again. Once again, thank you.” The edited recording, including questions/comments at the end: https://youtu.be/Xh_eWjsh3sw