Scotland voting for independence would be huge as it would spell the end of the UK. With unionists of Scottish background (Presbyterian/Methodist) roughly equal in number with unionists of English background (Anglican) , which part of the current UK should unionism seek to remain part of?

Equally the growth of English nationalism is a huge problem for unionism as the English see them as Irish rather than British and most have no commitment to keeping NI within the UK and no awareness of what goes on in NI.  

That is why unionists are so desperate to emphasize their "Britishness" despite the fact that the UK is explicitly the united Kingdom of Britain and N. Ireland (formerly Ireland).

They are also painfully aware that the UK government uses them when it suits and betrays them without a moments thought. It was the UK government, after all, which agreed the Protocol.

Index of Frank's Diaries