Alison, our aircrew notes were not classified but then you couldn't build an H2S using them
I do remember watching one of those training films we used to produce when we had money for professional film production, properly printed APs etc, which was about Green Satin. It showed how it worked and was a Canberra flying a route. It showed the Janus array pattern and the frequency beating against a radiation pattern on the ground. The aerial then aligned itself with the aircraft track.
That was in 1962 and was I think confidential - the military had state of the art kit compared with civil aviation
- well maybe it did when the only large jets were military with the exception of the Comet, but by 1962 the film was probably more than 5 years old.