I wonder how it looks to Americans (I assume you're both Americans or non-brits at least). Wondered if you'd have to be a Brit to find it even watchable lol. There's the v similar american one too The  Day After. Shame archivedotorg is down  

 I'm non-Brit and non-American but the world depicted in the movie is 40-year old so it's probably as foreign to anyone these days as it gets. And it quickly becomes agnostic in these regards (I need to be vague to not give away too much)