I've purchased goods and services from all over the world with my EU paypal account, i don't see a reason why the fact you opened your account in the UK would stop you from paying a company in the US. is there something i'm missing here?
BTW: not volunteering for the job, i won't give away my anonimity for a couple bucks
when I access the website from my UK location, it says for US residents only, I can get a US ip and use that to access the website but when I want to pay I would have to access my paypal and I can't risk accessing my UK paypal with a US ip as that could limit my account.