Smithy becomes a knight in shining armour for a shop assistant when he and Rickman apprehend a shoplifter, with a little help from Santa! The shoplifter is suspected of brutally assaulting a shop assistant in the same store. Duncan bonds with the suspect due to the boy being from Glasgow, but Mickey's hatred for Christmas leads to him refusing to help the boy out, although he attempts to track down a reported accomplice to the theft. Meanwhile, Debbie maliciously ruins Reg's plans for the Sun Hill Christmas Party, by getting the pub landlord's son arrested on drugs charges. When they reschedule at a nightclub, the party turns sour and a fight breaks out. Dave, having argued with Jenny about her hopes of moving to Colchester, acts on his feelings for Polly after Vicky's teasing about Polly and Tony being close.