Is there a name, derogatory or nice, for all those who come from the British Isles (and the Irish Isles if that’s not included in them)?
That is, who are either British, Irish, Scottish or Welsh?
UK-ites?
British. Period.
People who come from England, Scotland and Wales are all British.
People from Ireland, on the other hand, are Irish.
Well British, covers England, Scotland, Wales and Northern Ireland (though just under half the population of that province would disagree). Otherwise there isn’t really a concise word (unless there’s a really obscure one) for the whole of the British Isles.
slight hijack, apologies
What is the difference between being British and being a Briton?
Casey1505:
Sometimes the two are interchangeable, but Briton strictly refers to the celtic (i.e. pre anglo-saxon) inhabitants of the Island of Great Britain.
MC, “close, but no cigar,” as Monica Lewinsky said to the V.P. 
Briton = person of Brythonic extraction, i.e., a member of an ethnic group that speaks or used to speak a Brythonic Celtic language. Most usually applied to the inhabitants of Great Britain prior to the Dalriadic and Anglo-Saxon incursions, but quite applicable to the Lowlands Scots, the Cornish, the Welsh, and the inhabintants of the English Borders even today. (A very reputable 18th Century publication originating in Edinburgh was called The North Briton.)
If forced to come up with such a term, I’d have to use “British” as implying “inhabitants of the British Isles,” but bearing in mind that that usage would probably be offensive to citizens of the Irish Republic.
Yes, it would definitely be offensive to citizens of the Irish Republic, as well as being offensive to approximately 44% of citizens of Northern Ireland. Don’t use it.
Why should there be one term to cover all those people anyway, any more than there should be one term to cover, say, the Germans and the French? They’re different countries.
“Residents” of Northern Ireland, that should say.
The word Briton doesn’t quite have that precise meaning as it is often used to cover the picts, who may or may not of spoken Brythonic or even any form of celtic. Also the Brython celtic language and ethnic group strecthed into Gaul, Belgium and even further afield, but it would be incorrect to describe them as Britons (conversely the Bretans of Brittany are descendants of Britons). Again, for such a precise defintion it is NOT applicable today and when used when talking about a modern person only has the genral sense of someone from the UK
Hail Ants:
You may be a bit confused. You ask for a name for people from the UK (England, Scotland, Wales and N. Ireland), but then you ask about the “British Isles”, in which you include “Ireland”.
What do you mean by the “British Isles”? Does that include the Republic of Ireland as well as N. Ireland? If so, I’m not aware of a term to cover all those people.
UK= British (since you said the term could be derogatory, I think the N. Irish can then be included).
Interetsting to note that in sporting events, the UK components are often treated as seperate countries. I’m thinking of golf in particular. When country of origin is listed in tournaments, you always see England, Scotland, Wales and N. Ireland listed as though they were independent countries.
For most sporting events: international football/soccer, rugby union, commonwealth games, etc., they are treated as separte countries though there are a few exceptions to this: (the olympics, an occcasional rugby league touring side (which also includes Irish palyers too) cricket (though they are called England they include players from Wales too), plus a few other events.
A person from Britain is a Briton.
Sometimes it depends on the context. If they are talking about politics they may be British, but if they are talking about sport they will be English, Welsh, or Scots, unless it is something like the Winter Olympics where a Scots cross country skiier from the Isle of Skye who does well will be known as a “Brittish skiinig hero”.
Well, that’s kind of a nit Pict! 
As far as i’m aware No, there is not a name derogatory or nice, for all those who come from the British Isles. Well no popular ones.
Perhap “European” might work but that also includes all the other countries in Europe.Also there are possibly a few eurosceptics who might find that term offensive.
Mogiaw
There is a huge difference between the divide of Scotland and England, or Scotland and N. Ireland, and the divide between Germany and France.
To my knowledge:
The adjective, I think, for all people from the UK is British (this would be people from England, Wales, N. Ireland and Scotland), whether they object to this or not, it’s on their passport.
However the Republic of Ireland, although part of the British Isles, is not a part of the UK, and so people from there are hardly ever referred to as British.
btw the term ‘briton’ is often used as a term for a british person.
Except when a resident of the UK travels to France, Germany, etc. Don’t they refer to hat as “traveling to Europe”?
I’m not looking to start some convenient, insulting name.
I only asked because the UK & Ireland could be seen by others as one big group of islands where they (more or less) seem to speak the same language. So I though a term may have already been created at some point by those from the rest of Europe or Iceland etc.
Is POHM disqualified for being ‘insulting’ or is it just ‘teasing’?