Ah, yes, the classic 3-2-1 method: three accounts in two different countries, one of them being an offshore. Yeah, I’m doing all that (not the offshore part... at least not yet).
The "incident" has to be pretty severe for you to be debanked in multiple EU+UK countries. Little less than terrorism would do it (I was going to say coup attempt might, but the Catalan leaders who tried to illegally secede from Spain didn't get debanked, so probably not).
Then nothing short of planning a serious terrorist act can get you kicked out of all accounts.