When the Boat Comes In

Jack has returned home after a cruise and is bored, Lady Caroline announces that she is to marry a Coldstream Guard, and MR Seaton is out of hospital. S3 E13: A Marriage & A Massacre

Billy is in his father's bad books because of a rumoured romance that could ruin both of their livelihoods, and Jack helps the Duke of Bedlington to find out who is threatening him. S3 E14

Jack chases Billy's girl just to spite him, then he and his band of men catch the man who has been threatening the Duke and Lady Caroline. S3 E15: Please Say Goodbye Before You Go

Jack Ford returns in an unexpected style after six years in the US; after a nasty experience with a sadistic roommate, Jack realises that he has reached rock bottom. S4 E1: Back to Dear Old Blighty

Jack comes back to Gallowshield and is shocked to hear of Matt Headley's death; he feels that Sarah's brother is hiding something and sets out to discover what it is. S4 E2: A Gift From Heaven