I was the lucky recipient of "protect and survive" in my terrace house in York in the 1980s. We blithly understood the staircase was our best bet, both for initial blast protection and ultimate entombment. The Raymond Briggs cartoon book "when the wind blows" felt more realistic to most of us.
I did not enjoy watching Peter Watkins "the war game" which was with-held from general broadcast and mostly only seen in film societies. It wasn't exactly hyper realistic, but it was chillingly unpleasant. It was dated by the time I saw it (shot in B&W I believe, and in the sixties so over 15 years old by the time I first saw it)