Who declared GB to be a thing?
Scotland existed in some form before the Westphalia Treaty was even thought of.
And here's the map as the Treaty of Westphalia drew it:
Scotland and Ireland seperate from England.
Why would Scotland be fucked (if they had the rights to oil and gas revenues from the North Sea)?
And I say this as someone who is fairly ambivalent to Scottish independence and who holds next to no sympathy with the SNP.
GB is the name of the Island....
Great Britain or Britain[8] (Welsh: Prydain Fawr, Scottish Gaelic: Breatainn Mhòr, Cornish: Breten Veur) is an island[9] situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles. With a population of about 60.0 million people in mid-2009,[3][10] it is the third most populous island in the world, after Java and Honshū.[11] Great Britain is surrounded by over 1,000[12] smaller islands and islets. The island of Ireland lies to its west. Politically, Great Britain may also refer to the island itself together with a number of surrounding islands which comprise the territory of England, Scotland and Wales.
I don't know who declared it that way, but it is that way.
By your logic on the treaty of westphalia - germany & italy don't exist now either because at the time of westphalia they wern't united. Westphalia set out the criteria and the rights of a sovereign state. When the union was ratified in 1707 Scotland and Wales lost all right to sovereignty. And also Scotland took over England in essense. (im sorry to quote wiki but i care so little for British history I don't keep books on the subject)
"The two countries had shared a monarch since the Union of the Crowns in 1603,
when King James VI of Scotland inherited the English throne from his double first cousin twice removed, Queen Elizabeth I."
I have heard the North Sea Oil argument, but look at it this way. North Sea Oil is property of the United Kingdom, if Scotland leave the United Kingdom, why do they have any right to the oil? You wouldn't be a part of the country that owns it and that country would have no reason to give you its biggest oil supply. Also you wouldn't have an army for the first few months of independence (if it went cold turkey) so anyone could just take it from you.
I really don't care about devolution, i believe in self determination (if the majority want it then have it and deal with the problems it creates yourself). I feel no sense of ownership or superiority, to me the United Kingdom represents all the citizens of the country and serves the purpose of all of them. If scotland had a population that matched that of England then you would be equally represented in the UK parliament - its democracy..but that shouldn't matter as we all live in this one country.
I actually worry about scotland gaining independence for the political landscape in England, Labour have always relied on Scotland in the General Elections, we would become a tory country for the foreseeable if you went your own way.
But I put this to you - In a globalising world, a world where I can debate british devolution with a guy in bolivia instantly, a world where i can get to the otherside of it in less than a day, a world where i can video chat with someone in australia etc., is there any need to fragment and declare self determination, what purpose does it serve? Tradition and herritage don't hold purpose for the future, they only serve to hold back human development. Is not better to just recognise we are all just people and move forward rather than backward?