But eph is right. All addresses in "Norn Iron" have a UK postcode, beginning BT [for Belfast]. So while a letter addressed to... Someone BTXX XXX GB ...woul

But eph is right. All addresses in "Norn Iron" have a UK postcode, beginning BT [for Belfast]. So while a letter addressed to... Someone BTXX XXX GB ...would probably get there, it would technically be incorrect. Mind you... Someone BTXX XXX UK ...might not get there either, if your postie was a dyed-in-the-wool republican!