If you're really gonna go with "only civilized nations count, not barbarians" then I'm afraid we really do have to let India rule over UK.
After all, India had a rich and ancient civilization that had accepted things like LGBT minorities at a time when the British empire persecuted them and considered homosexual acts illegal. Which one of these are the barbarians in your mind?
And as Jacob seems to believe that uncivilized nations don't count, India clearly should be the one with legal power over the entire "British" empire.