Hate to say it - but the diagram's wrong!Wales and England are separate countries... and people from Wales are never very happy to be called English...but don't mind being called British...Sry - had to point it out.
ye thats odd that England and Wales are in the same circle.
Wales is a Principality of England, and was conquered by England as opposed to Scotland, which entered into a union with England.England and Wales are often mentioned in the same sentence, when referring to organisations or legal jurisdictions. So I guess you could say that's why Scotland gets its own circle, but not Wales.One more little thing- people often assume that the name Great Britain is the British being arrogant, but its just a geographical reference to the size of Britain once England and Scotland formed a union.
http://en.wikipedia.org/wiki/File:British_Isles_Euler_diagram.svgmore politically correct emphasis regarding Eire