The current design dates from a Royal Proclamation following the Union of Great Britain and Ireland in 1801.[4] The flag combines aspects of three older national flags: the red cross of St George for England and Wales, the white saltire of St Andrew for Scotland (which two were united in the first Union Flag), and the red saltire of Saint Patrick's Flag to represent Ireland.
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But as you can see, Irish get offended if you include them as part of the UK, so to be politically correct (and British do think of Ireland as it's own country anyways)
UK = England, Scotland, Wales & Northern Ireland.
England did try to completely rule all of Ireland but only got the north part, thus is part of the flag.
There could be a King Britain "like King Europe" wearing that flag. Wales, England, Scotland and Northern Ireland are part of Great Britain. But Ireland isn't.
19 M
Ireland isn't part of the UK, only Northern Ireland is. They even have different flags.