The UK, Britain, England

The British Isles: A geographical name for the group of islands comprising Btitain (which has three countries, England, Wales and Scotland), Ireland (the whole land mass, including Eire and Northern Ireland) and numerous other islands around the mainlands of the two larger islands. Great Britain: Includes the kingdoms of England, Wales and Scotland. Usually means the mainland and associated islands of the largest island and excludes Northern Ireland. Sometimes shortened to 'Britain' but this name properly describes the lands which were originally occupied by the Brythonic Celtic tribes. The United Kingdom: The shortened form of the full name 'The United Kingdoms of Great Britain and Northern Ireland'. Wales and Scotland were originally kingdoms. Wales is now a Principality and Scotland has shared it's monarch with England since the reign of the Stuarts (though some would disagree). Does not include Eire (or Southern Ireland) which is an independent country. England: A country which comprises the major part of Britain, excluding Wales and Scotland. Politically, the United Kingdom [of Great Britain and Northern Ireland] is one unit but Scotland, Wales and Northern Ireland have their own political assemblies and some laws which differ from those of England. David Cameron is Prime Minister of both England and of the UK. I would correctly describe myself as a citizen of the United Kingdom, a British subject and English by birth (meaning that I was born in England of English parents). I speak English (but cannot always understand all English speakers because their dialect is sometimes very different from Standard English) but I also know a few words of Welsh (which is one of the four Celtic languages still spoken in the British Isles and entirely different from English) but no Scottish or Irish Gaelic or Manx (which are all separate, but closely related, Celtic languages).

Commonwealth realms: United Kingdom, Canada, Australia, New Zealand, Jamaica, Barbados, Bahamas, Grenada, Papua New Guinea, Solomon Islands, Tuvalu, Saint Lucia, Saint Vincent and the Grenadines, Belize, Antigua and Barbuda, Saint Kitts and Nevis. Cameron is the current Prime Minister of the United Kingdom. Great Britain / United Kingdom is the name of whole kingdom and contain 4 countries: England, Northern Ireland, Scotland and Wales.