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I must admit I join others in congratulating you for such a fine post, a straight forward , no insults, no name calling informative post.
Now, how did you know there was a 'BUT' on the way. :o)
You say "As far as I am concerned, I am British / English by an accident of birth, and nothing more".
True, we are all here by birth, I wouldn't go as fas to say 'accident', perhaps some but not all.
But, looking at it another way, we could have also been born an animal, a insect, or a fish, take that you were born a dog.
Would this have conferred on you some god-given right to adopt a superior attitude over a cat? Which had in turn been born by a similar quirk of fate a cat?
Having then established his superiority over the cat, I think the dog would then claim proprietorial rights to that patch of land he claimed as his territory, by birth right.
A rather silly analogy, but what the hell. :o)