Ok, its fairly obvious a bit more information is needed here.
England and Scotland became the United Kingdom when Elizabeth 1st (the virgin queen) died childless, and James VI of Scotland, by the laws of succession, also became James I of England, round about 1603? This was not popular in England, but canny James overcame his assorted shortcomings by some astute political maneouvering and some notable achievements, such as commissioning the King James Bible.
For a century the two countries remained separate entities, just with the same head of state. The act of union united the two parliments in 1707. Curiously enough, it was the Scots who pushed for the Union, the English again were fairly ambivalent.
I dont know what the Scots Nationalists are plotting. Certainly a dissolution of the political union. Whether they also plan to dissolve the monarchy, I dont know. I dont know if legally they can actually DO that. I think the only way they can get rid of the monarch is by force. They are all a bunch of rapid leftists so who can tell?
So, to sum up, we could have the Kingdom of England and the Peoples democratic republic of Scotland, or we could have the United Kingdom of Great Britain and Northern Ireland, with England and Scotland being separate countries, or we could all come to our senses and keep the present arrangement going and get rid of that stupid tier of beauracracy in Holyrood.
Finally "Great" Britain (thanks for the quotes) is not in any way a measure of us all thinking proudly how "great" we are. It is "Great" as in "Greater", i.e. "big". Big Britain, as opposed to "Little" Britain, i.e. Brittany in France.
To continue...when Queen Anne died, Parliament passed over James Stewart and offerred the throne to George, Elector of Hanover. George's mother was a granddaughter of James I. George couln't speak English, but London society preferred a sophisticated German continental over a kilt-wearing Scotsman (the English thought of and treated Highlanders much in the same way they thought of and treated Mohawks). This sparked outrage in the north as Scotland had always been ruled by a Scotsman (even Edward Plantaganet's puppet, John Baliol, was Scottish). James Stewart, aka "The Old Pretender", raised an army, marched on London, and almost won. His son, Charles Stewart (Bonnie Prince Charley or the Young Pretender) tried a second time and did not succeed. The ousting of the Stewarts began the Scottish migration to America where they became heavily involved in another, more famous rebellion against the English: the American Revolution.