I only saw a little bit of it, but I thought the NHS thing was really well done. When I heard that it would involve Mary Poppins fighting a giant Voldemort my eyes rolled out of my head. When I actually saw it done, though, I was really impressed.
The only other part I saw was the "digital age" and I didn't like that at all.
Also, the American commentators (Brian Williams and Meredith Vieira) were horrible.