Peter, if you don't mind, I just took your idea and am posting the last links over at my blog, which has the same problem.
Sure, help yourself. Is the US blocking them as well, or is it just for your UK visitors?
I'm in the US and I'm not having any problems. It definitely seems to be a problem caused by the British government. Note how Zippyshare has been added to this list:https://en.wikipedia.org/wiki/List_of_websites_blocked_in_the_United_Kingdom