I expect they're trying to log web surfing habits into the latest "Big Brother" database that I've just been hearing about.
Don't they (the NHS IT Thought Police) also block access to certain other sites (like eBay, for example)?
They're probably also wondering why the site gets so many hits from within NHS intranets, I should imagine. You have been warned.
Or maybe they keep tabs on the threads, and have detected a whiff of
criticism of the Almighty NHS!