I'm in the UK, and the HTC One is marketed as as a quad band which mean it'll work world wide. I get HSDPE, HSPAP and UMTS, I know that's GSM but other than that I have no idea what all that means. I have plenty of towers around me I guess. I have been to HTCdev and they do ship to the UK.
@Hadron, I found you a 64GIG phone