I'm having the same problem but mine is particularly baffling seeing as I'm only being blocked from one program, and other users on campus are not having this problem at all - we all have identical IP addresses - when entered into the RIPE website it tells me GB. However, surely the ISP cannot have registered the IP address with the wrong database seeing as my friend in the room next door is not experiencing problems and we have the same IP when we both do the 'whats my IP' and 'Ripe' thing.
This makes me think it is my PC which is a problem, however, on the advice of all sorts of computer-y people and ITV as well, I have deleted all temp internet files/cookies etc., ensured my language and region is all UK, my computer clock is on GMT, and I've checked with my computer office that my internet connection in my room is not being limited to a 'visitors' connection as opposed to 'student' connection (which has full access rights to the university network). As far as anyone can see there is absolutely nothing actually blocking me. Have I missed something?
Can ITV block specific computers? I don't have a clue whats going on!
Oh, and just for the record, I'm sat in a student room in Oxford, UK, I'm not in Peru or anything!