The United Kingdom of Great Britain and Northern Ireland, usually just known as the UK, is a country off the coast of Europe, quite near to France. It is made up, as you might expect, of both Britain and Northern Ireland. Britain is made up of Scotland, England and Wales. It should be noted that These are all separate terms and should not be used to refer to the same thing.
England is Situated in the south of Britain. Its capital city is London.
Northern Ireland refers, shock horror, to the northern part of the island known as Ireland. It is not to be confused with the Republic of Ireland, which is not part of the UK and makes up the rest of the island.
Scotland makes up the nothern part of Britain.
Wales is in the west of Britain.