MC Dizzee Rascal, radio DJ Nick Grimshaw, psychologist Philippa Perry and actor-writer Reece Shearsmith brave the baking tent in the name of charity. All that stands between them and the title of Star Baker are three challenges - vegetable slices, a `right royal" technical and a biscuit selfie depicting themselves at work. Paul Hollywood and Prue Leith judge their efforts, while Matt Lucas shouts out how much time is remaining in a silly voice