By similar rationale, however, you could make a solid case for the English Empire including Canada, Australia, and New Zealand (along with, IIRC, 50 other countries). After all, Queen Elizabeth II is Queen of the Commonwealth. Or, if it's specifically the reign of Queen Victoria that rankles, do you do about Queen Elizabeth I? What nationalities/cultures does the English Empire presumptively include based on her reign (late 16th century?)?
Or a solid case that France should include America, since during the reign of Louis XIV, much of the modern-day US was (at least nominally) owned by France.
Well, who's to say what all those fictional bits of land on a civilization map are not called "Australia", "America", "New Zealand" etc? My civilizations usually end up expanding into all sorts of new and exotic places, but we don't know what they're called.
Actually I'm in agreement with you on the English/British thing. The argument "But the redcoats were British, Queen Victoria was British" etc overlooks the simple fact that if the civilization was instead called British you could just as validly retort "But the first settler units were English, the warriors were English, the archers were English, the pikemen were English, Elizabeth was English" and so on.
Lets' face it, when a country is called one thing up to 1707, then a different thing after 1707, you are never going to find a term that is valid for all its history. No matter how much you argue!
How do we solve this problem? Well, here's one way:
"English" civilization c400AD to 1707 = 1307 years
"British" civilization 1707 to 2005 = 298 years
1307 > 298
The English win!
The fact that the English came before the British, and account for 85% of Britain's population, are just added bonuses.
Just the way I look at it. I have no problem with people who'd prefer to play with a "British" civilization instead.