Look, a shower can get you clean, but a good hot soak is a chance to think and relax. Lots of great ideas came from a bath.
Where has Philip brought them? Does he even know? Does he have any control over it? Dunno. But the same is true of Doctor Who. And one of the most fun parts of a story is seeing where they arrive each time.
And five points to whoever figures out the Easter Egg in this page first.
