EU Citizen here, living in the UK or "wherever I may roam".
I have my Ltd in the UK. I am sticking to the UK for the time being, and will keep a close eye at:
1) Tax scheme/calculations for dividends.
2) Ability to transfer money in & out and at what cost (in the extreme case of Capital Controls or limiting transfers abroad).
3) Exchange Rate of GBP against EUR, USD, and a couple more so I make sure that my payments are not losing 10% on the get-go.
All the above are extreme situations. If I feel that my income/finances are threatened, then I will act, otherwise I will continue to support UK economy as UK has been "supporting" me (not really), these years.