John Arnold

as Jack's Grandfather

as 'Old Chap' Arnold Jones (2 episodes)

as P.J. Foster

as Jock (1 episode)

as Colin Pierce

as Dennis Hughes Q.C. (1 episode)

as Sure Thing Sam (1 episode)

as Dave (1 episode), as Senior Railway Clerk (1 episode)

as Cullen (1 episode)

as Reynolds (2 episodes)

as Jimmy Doyle (1 episode)

as Gordon Hendricks (1 episode), as Det. Sgt. Steve Milich (1 episode)

as Detective

as Lt. Hunter (2 episodes)

as Munch

as Man Selling Dog