Why- if it was planned- has the Queen gone to Sandringham?
Tradition, innit. She's a great one for sticking to tradition and the stiff upper lip. After all, she can get to the hospital pretty quickly if she needs to.
Why has he had to travel to a London hospital?
They always go to that hospital, don't they, unless it's an emergency? I assume there are benefits around the fact that the hospital is used to the security and other protocols involved and has experience in fending off reporters.