4pon4pin
I do believe we are talking of different films.
Anything filmed in the mid to late sixties may well have been in colour and would probably have included the Avro748 or BAC 1-11.
Apart from that blind landing research was already well advanced by the mid to late sixties, the film I refer to was about the very first experiments and was very black and white and narrated by the same person that did Movietone News at the cinema!!! Also it was a Varsity that I remember, (viewed from below with a diamond shaped tail plane).