Guest Stars Amanda Want as Christine Robinson Carolyn Pickles as Diane Robinson Jack Ellis as Sergeant Chancellor Denis Lill as Tom Porter Nicholas Jones as John Packard Patrick Drury as Gordon Robinson Elspet Gray as Mary Porter Stephen Kemble as Willie Mossop Vicky Murdock as Tina Watson Constance Chapman as Trissie Auden Dennis Conlon as Barry Emma Hewitt as Liz MacLean Guy Keith Miller as Roger Robinson Michael Lees as Colonel Johnson Pat Keen as Mavis Watson David Wilson as Simon Leech