@ProfBob Would you call the Eurozone, e.g., a "unified state" without a central power locus?
(fair comment btw, though as a unionist Scot, I would not make your "correction" for England. Some English people just don't have enough awareness of the RoUK.)
@ciwp1 @ProfBob That's a good question and I think the answer is no and that, again, is our problem in understanding the Euro and how a common currency could work without a controlling centre of political power. The Eurozone is dominated economically by France and Germany and they will be powerful voices in any debate but I do not see any direction of travel towards what we might think of as a federal state.
On Scotland - having studied there and hoping in the near future to return to live, I am always surprised by the strength of its cultural links to the continent. Perhaps in the UK we should think of emulating the EU model where England cannot simply overrule Scotland, Wales, and NI by force of Parliamentary arithmetic.