England doesn't 'sign off' for whether Scotland is in union or not as that is Scotland's choice, not England's. England acknowledge this and would never say otherwise.
Also, I imagine that Spain will do what they're encouraged to do by thE EC considering the budgetary reliance.
Not at all wanting a flame-war etc but if I'm wrong then I'd really like to know! :)
The correct year to consider it fully a region of Spain would be 1714, when the Spanish army defeated the catalans and removed most of its state structures/institutions, etc. This article's intro might help: https://en.wikipedia.org/wiki/Principality_of_Catalonia
I don't want to bore you with a history lesson that I myself might not know accurately, but I feel the need to say that different namings for the same levels of independence of state structures should be taken into consideration. So saying "Catalonia has always been a region of Spain" is far from the truth or at least it skips a lot of history.
I didn't mean any offence by my statement, I understand that of course Catalan's case for independence is no less valid! I suppose it's really just legal wrangling :)
'Brexit: Spain and France oppose Scotland EU talks' - http://www.bbc.co.uk/news/uk-scotland-scotland-politics-3665...