So I looked up Schengen as the UK's status had never occurred to me. They are not in Schengen, even though they could have been, since you need not be EU to qualify. So I don't think Brexit directly influences anything for better or worse.
I ddi read some interesting stuff about Ireland. Northen Ireland voted to Remain. Their assembly also voted "not to approve" the Brexit deal, a matter on which of course they had no authority to opine. Allegedly, there were no dissenters.
The Economist is saying this will lead to reunification. Text of the Economist piece. I never even knew this was an option. I wonder N Ireland will hold a referendum.
It's different from Scotland because Ireland is already in the EU. Scotland would not qualify for the EU because of their deficit, which makes the independence threat a bit of a joke, although it is "credible" it is also quite stupid unless they can grow out of their dependence. It's shite being scottish, lowest of the low, scum of the earth, being colonized by wankers, ruled by effete assholes. Deal with it I guess.