Daphne Du Maurier's "Rule Britannia". Future dystopian novel about Brexit written in 1972 and set a few years later. The UK has pulled out of the EU after a rigged referendum and is under armed occupation by the US and its British collaborators. I'm only a short way into it and so far she's spent time developing her cast of very odd but completely convincing characters than in working out the political issues, but iit's looking good. I don't think it's been reprinted recently, which seems really odd.