I've often wondered about which label was the correct one when describing various countries or groups of countries in the British Isles, and thanks to the Grammar Girl Facebook page there's an easy to follow diagram.
In a nutshell:
The Channel Islands are Guernsey and Jersey.
The Crown Dependencies are the Isle of Man, and the Channel Islands (above).
Great Britain is a combination of England, Scotland and Wales.
The United Kingdom is Great Britain plus Northern Ireland.
The British Islands are the United Kingdom plus the Crown Dependencies.
Ireland consists of the Republic of Ireland and Northern Ireland.
The British Isles is all of the above!
So in case you were wondering...................now you know!