My god, it was. I was a child at the time it was made, but very clearly remember the nuclear threat - the pamphlets and public information films. It seemed to be spoken about quite normally at school.

I'm old enough to remember the Cuban Missile Crisis in 1962 (I was 9) and the BBC film 'The War Game' (banned in 1966 when it was made for being too scary) but shown at our school in 1967. en.wikipedia.org/wiki/The_War...

The War Game - Wikipedia