So Ben and Polly complete their audition to be the new TARDIS crew, and the Hartnell era draws to a close in terms of stories we can actually see the whole of. So what does Pip Madeley, Twitter sensation, make of it all, and will he and Toby choose the same favourite thing as Frank Butcher from Eastenders, Skart from The Power of Kroll but not Mike Yarwood do battle against a giant computer and put a box in the ring.