The director, Mick Jackson, later made Threads [1], which is one of the bleakest, most depressing films ever made. Highly recommended, though not for the easily disturbed. It's filmed like a documentary, not too different from A Guide To Armageddon.

He also made Connections [2] with James Burke, which is a fantastic documentary series about the history of science.

(His later, very commercial Hollywood work is less interesting, though Steve Martin's L.A. Story is great.)

[1] https://en.wikipedia.org/wiki/Threads

[2] https://en.wikipedia.org/wiki/Connections_(TV_series)

Also Threads, from the same era, incredibly bleak depiction of British society in the aftermath of a nuclear attack.

https://youtu.be/vgT4Y30DkaA

(For those who haven't seen it, it is grim, but gripping.)