Again, assuming it’s all not some elaborate bluff, thanks to the Radio Times (via Entertainmentwise), we learn why Billie Piper’s leaving Doctor Who:
The longer I stayed, the more scared I’d be of leaving because it’s so comfortable and nice. I’m utterly grateful for the whole experience but you have to take care of yourself and do what you feel it right.
Okay. Not much of an explanation, but I suspect that’s the best we’ll get until her autobiography comes out. She’s 23 and she’s writing it now. At that age, my autobiography would have filled a couple of those notepads you find in hotel rooms.