My article on whether UK cloud users are legally restricted from using US cloud providers' services under data protection law, given the risks of the US PATRIOT Act, is now in the ComputerWorldUK Cloud Vision blog. Link here.
I also want to point out another useful resource which was published after I'd sent the article in to ComputerWorldUK, namely a paper by Hogan Lovells on government access to cloud data in Australia, Canada, Denmark, France, Germany, Ireland, Japan, Spain, United Kingdom, and the United States. Summary chart of findings and link to full paper here.