Actually, I rather like that idea. Anthony Daniels can certainly be properly posh and if you've ever seen him at conventions, especially in a "master of ceremonies" capacity (which I have), you'll realize the guy is an absolute scream! His sense of comedic timing is positively wicked!
Seriously, I think he'd make a great Doctor!
I know he can be very funny, but from the 'stories' from Star Wars sets he can be very difficult to work with too. Personally I would say no to him, I would love an actor who'd be here for ten years who'd make the Doctor 'his role' for this incarnation similar to Baker.