Brook's a fairly common word isn't it? It's not like laine which I've come across in the context of North Laine and nowhere else (still no excuse for getting it wrong though :wrong:).
I don't think these specific issues are brexit related, but I'm sure somebody could be found to disagree with me.
I can see you spending longer at customs/passport control, and the train timing seems to depend on you arriving at the station at exactly the right time. And the trains running...