I was in the process of signing up for this when I discovered that I had to commit to having Express Checkout on my website as part of the sign up process. Looking at the 1.3.7 documentation this support is not there for the UK yet.
So two questions
1 When is this planned for?
2 As a new user I might download 1.3.7 from the website thinking that this version will work in the UK. It sounds as if the 1.3.7 version is "not for the UK, if you want to use PayPal" - is this correct? If so, might be a good idea to make that clear on the download page. Can't imagine their systems are that different though. Something to do with the PayPal integration certification?