I Am Sure We All Know That The Union Jack,

is the flag of Great Britain,

representing the 4 countries that make up the British Isles, namely England, Scotland, Northern Ireland (since 1921 only Northern Ireland has been part of the United Kingdom) and Wales, but it is not so, only 3 countries are represented on the flag, Wales is absent, the reason? Wales was not a Kingdom but a Principality so it could not be included on the flag.

in case you do not know and are interested here is the make up of the Union Jack, as an aside to anyone hoisting the Union Jack please make sure is is the correct way up, the broad white stripe is always at the top of the flag and is always next to the flag pole, it is surprising how many people get it wrong! just in case you thought I have left the people of Wales and Southern Ireland out,

here is the flag of Wales,

and the flag of the Republic of Ireland or Southern Ireland.