Overview: Sarge, Ding-Dong and Carter try to resist a heavily pregnant Christmas allegory.
Overview: Psychoanalysis is a dangerous thing.
Overview: Our trio are reunited with their long-lost son.
Overview: The arrival of guest star Peter Vaughan starts talk of mutiny.
Overview: Carter and Ding-Ding compete over a chance at the fabled Heathrow job.
Overview: The Prodigal Swan returns.
Overview: The boys get new surveillance equipment and are soon under threat of being replaced.