It came up for me "Not currently available" but there other documentaries of similar length as well as 1 hour 40 minute hour presentation that he gave to the Royal Aeronautical Society.
There is a short clip on the "Harmony of Control" mentioning the Lancaster. He said "this was an aircraft just asking to be flown." Dad spoke about the wonderful control and feel for the aircraft. Somehow I don't think the same could be said about the B-29, which reputedly was an extraordinarily difficult aircraft to fly.
Jim