The guests joining Lee Mack and David Mitchell are Dr Maggie Aderin-Pocock, Phil Wang, Jason Watkins and Adam Woodyatt.
Ben and Cat are joined on the sofa by Anton Du Beke and `Britain's Got Talent' star Lucy Heath and her canine co-stars. Adam Woodyatt, who plays Ian Beale on `EastEnders', opens up to Sharon Marshall about starring in the first-ever episode.