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/// I don't know if a person is from India, Pakistan, Sri Lanka, etc, I can't tell by looking at them. Same as I wouldn't know if someone was from Japan or China. ///
I did not mention Pakistan, Sri Lanka, etc, I mentioned the Indian sub-continent.
Neither did I mention Japan, but if I were you if you cannot recognise a Chinese person by looking at them, then may I suggest a trip to SpecSavers?
/// If they speak with an English accent I only have an idea of what part of the world their ancestry is. ///
Well there is a contradiction of terms if ever there was one.