Irish, Welsh and Scottish nationalism are focussed around opposition to Westminster, which I can understand, to a certain degree, and on a more basic level, dislike of the English, who are the majority population in Britain.
The whole situation is dreadful. Welsh and Scottish nationalism (separatism, not economic nationalism, as in true nationalism) are being used to break up the UK (a natural strategic unit) and absorb the component parts into the hateful European Union.
I feel that the home nations should have local economy and democracy and separate national institutions, but that they should not break away from each other.
The balance we have now is just about right, as Scotland has a separate legal system and national institutions, and the Welsh (great people by the way) are culturally very nationalistic. The problem is the European Union, immigration, multiculturalism etc.