Thanks Carl....I saw this when it was first broadcast. I was at the RAE Farnborough at the time and would often have to go to London. The offices were at the far end of Neal Street from Waterloo so I would stop off and see David Turner. He told me about Kite Workshop and the Cody train. I was able to invite Nick Morse, John Peyton and Martin Lester to the RAE with one of their Codys and compare it with an original. Later I invited David and Nick to give a talk to the Royal Aeronautical Society...it was how I got involved with kites.
When was this originally broadcast? *EDIT:* Okay, copyright date _"MCMLXXVII"_ was visible at the end of the video. That is _1977_ -- I used an online converter to VERIFY that was correct...😊
The history, technology and operation of the Cody system are described comprehensively in Percy B. Walker's EARLY AVIATION AT FARNBOROUGH: VOLUME I: BALLOONS, KITES AND AIRSHIPS (1971)