Whether or not it counts as PTSD, I remember it being a stressful time, causing worry that has persisted through to the present. There were the films, of course; When the Wind Blows and The Day After are films I watched (the former was also available as a graphic novel IIRC). I'm not sure about Threads, but I definitely saw The War Game (
https://en.wikipedia.org/wiki/The_War_Game). The scene with firemen trying to put out a firestorm and being suffocated has stuck in my head.
The Protect and Survive booklet (
https://en.wikipedia.org/wiki/Protect_and_Survive) was around to instruct families in how to construct temporary makeshift shelters against nuclear blast. I recall such planning, including watching a film explaining how long the various Protect and Survive shelters might last at different distances from a blast ("The occupants of this shelter will be fine, for 6 seconds until the blast wave hits..." etc. etc).
Military training at school (
https://en.wikipedia.org/wiki/Combined_Cadet_Force) also involved, from time to time, lectures from liaison officers who would remind us of the odds against us in terms of land forces, and how long we might hold out before things went nuclear (should the Warsaw Pact have attacked NATO).