Brazil is an excellent film. Could do with seeing it again. It was on BBC2 late last year and started watching it but I was a bit tired and couldn't really concentrate.
Not really a film but from a 90 minute television docudrama (which may as well have been a film), but the scene of the nuclear bombs going off in Threads was genuinely one of the worst things I've ever seen. People running and the fires that there were, the people putting together mishmash shelters when the siren sounds and the kid being left outside... Ugh. If you have time to spare, look for Threads on GoogleVideo. Fantastic programme.