For anyone interested in this subject / genre I recommend "The War Game" by Peter Watkins [1]
Also by Peter Watkins, "The Journey" (aka "Resan") [2]. Quite long, that one.
Threads is one of relatively few films I have ever been inclined to re-watch. In fact, I watched it soon after the first covid lockdown started, followed by bingeing on "I Shouldn't be Alive". Quite curious about the psychology behind those viewing choices!!
[1] https://en.wikipedia.org/wiki/The_War_Game
[2] http://pwatkins.mnsi.net/journey.htm (NOTE: not SSL!)