There's tons of footage, with narration, like this. You can also get the odd 1960s and 70s no nonsense training films, although I've not come across that '80s favourite, Hissing Sid! Not yet anyway. However, you may recall the opsec film where a young man is thumbing a lift, a young airman, based at Wittering, stops to give him a lift and a security compromise surrounding a Harrier deployment to Scotland starts to unfold from there. This film is from around 1974/75 and is about the only one I've seen since service days that is anything like the real hardnosed 'watch yourself' type instructional/training films which used to be shown. The best was an officer who was being blackmailed by the KGB after having "a very good night out!" as hissing sid explained.
FB