What is the difference between The United Kingdom and Great Britain?
The United Kingdom is made up of the countries of England, Scotland, Wales and Northern Ireland. Its full name is the United Kingdom of Great Britain and Northern Ireland.
Great Britain, on the other hand, comprises only England, Scotland and Wales. It is the largest island of the British Isles (Northern Ireland and the Irish Republic form the second largest island).
Great Britain = England + Scotland + Wales
The United Kingdom = Great Britain (England + Scotland + Wales) + Northern Ireland
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The Isle of Man and the Channel Islands are not part of the United Kingdom. They are largely self-governing with their own legislative assemblies and systems of laws. The British Government is, however, responsible for their defence and international relations.