Derek has been driving Debbie up the wall again. More correctly, Debbie's been learning to drive and Derek's been learning how not to teach her. The fighting reaches a head when Debbie slams the brakes on their grand affair - and starts seeing someone else in her lunch breaks. Meanwhile, the staff earn extra money by assembling Christmas crackers, and TJ and Karen become attached to one another when an experiment with a set of handcuffs goes horribly wrong