Different situation as this was not a Civil war, they would just close down areas & nothing would get in.
A Civil war would give them more powers.
the UK pretty much produces nothing that the rest of the world would miss, the only thing the UK does mainly London is finance.
This country needs taxation to survive, no one working equals no taxation.
The UK is already heading towards being a third world shit hole and after Brexit it makes it harder for UK citizens to leave and go and live in Europe.
Before Brexit you could just up sticks and move anywhere, now you have to apply to other countries to live there.
That was one thing that people voting Brixit didnt realise would happen.
The main reason people voted Brexit was to stop mass migration, we have been lied to for the last 20+ years regarding migration