@GalacticTurtle Oh, that’s a big ol’ can of worms.
Scotland had a referendum on leaving the UK in 2016 (? I think: then-ish), which voted no by a fairly narrow margin. Wales has a pro-indy party that’s never been hugely successful in the elections. NI has (I think: someone correct me!) a rule in place that there will be a referendum on leaving the UK to join RoI if polling on both sides of the border reaches a certain level of support (presumably 50%, but I’m not sure).