The United Kingdom nation is already there, it's just called Great Britian.
The 1801 United Kingdom of Great Britain and Ireland has a different flag and a different name from the 1707 Kingdom of Great Britain, so it is a popular new country to mod in for roleplaying and historical reasons. I agree that they are basically the same country though, so if we could change a country's flag and name via events then it wouldn't be necessary.
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