I am 65% British:
"Congrats, mate. You're are probably British.
(If not, definitely Australian. Or Kiwi. Or Canadian.)
You enjoy most aspects of mainstream British culture, without being stereotypical about it.
You also have a typical British temperament. You wouldn't dream of being impolite."
I think that some of the results, e.g. that in the OP, could be offensive to British minorities.
However, I agree that we British are always polite, and any bleedin' foreigners who disagree can go *%$£!