Asking Brits who saw Threads when they were in school in the 80's (I guess you're probably in your early to mid 50's now, right?).

How did you and others in your class react to the film? Did you and your peers worry much around that time?

Just finished it myself, and it was very convincing in how it depicted the effects of a nuclear attack. Some of the events detailed as precursors to nuclear war were also worryingly similar to current events.