He can be a somewhat dour lad, but that thinking is a trifle too stereotypical, even for me. Given that most "English" people can boast an Irish, Scots or Welsh Grandparent it's pretty moot about ethnicity: nevertheless, as we know, cultures are very different to some notion of "race". Scotland defaulted over Darien. The English bought them and used them as shock-troops in the building of an empire, buying the Scots peerage and allowing the clearances to develop into Victorian industrial country shooting ranges stocked with pheasant and grouse, but few people...and of those, those male children who would not inherit, would go to the regiments.

I simplify, but...
When industry and commerce came again to Scotland, the divide between the incoming Catholic Irish, and the Protestant Scots was nothing to do with the English. Yet the Catholic "Irish" Scots are the biggest callers for ending the Union. There are too many variables at play to do anything other than base predictions on polls. Being half Irish myself, weirdly, I'm a Unionist.