Dr. Statham enters politics but requires a voice coach and the use of a car with two loudhailers! Martin inadvertently becomes a pimp. Mac and Caroline get a little closer but Holly sticks her oar in with a little ginger surprise for Mac. Harriet and Lyndon manage to have a date despite Joanna's best attempts to sidetrack her with work. Guy is not exactly the best flatmate but is he there at the right time for Caroline?