I hope I don't screw this up too badly.
England, Scotland, and Wales are three nations that coexist on one island, called Great Britain. Technically, the English, Scots, and Welsh are all British. The United Kingdom includes Great Britain, Northern Ireland, and a few smaller islands.
What separates England from Scotland and England from Wales is mainly geography and partly culture.
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"And Wirthling isn't worth the paper he isn't printed on."