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At least for the identification sticker / stripe on cars we've moved from GB to UK. Maybe we'll just move to uk as the ISO 2 letter code.

Apparently "United" and "Kingdom" aren't valid for ISO, so they went with ignoring part of the name completely.

That’s interesting. It kind of makes sense. I guess the US makes this rule kind of funny too. I guess we’re lucky we didn’t get .am for “America.”

IVR codes are not ISO 3166-1 codes. The ISO codes are all two letters; the IVR codes range from one to three letters.