West Coast, there are only 22 countries the UK has never invaded. I think that’s a record that will be hard to beat....
(It might be less than that - see link below reference Guatemala. I spent 3 happy months at Butcher radar in Belize back in 1979. The same may apply to a couple of the others as well)
https://www.vice.com/en/article/xdmq...army-civil-war
https://www.statista.com/chart/3441/...ed-by-britain/