- Nigel Davenport
- Â Jim Fraser 13 episodes, 1975
- Michael Witney
- Â Frank Ward 13 episodes, 1975
- Angela Douglas
- Â Julie Ward 13 episodes, 1975
- Barbara Shelley
- Â Elaine Smythe 12 episodes, 1975
- Calum Mill
- Â Angus Gallacher 12 episodes, 1975
- Angela Cheyne
- Â Shona Campbell 12 episodes, 1975
- Andrew Robertson
- Â Donald Cameron 11 episodes, 1975
- Glyn Owen
- Â Jack Mullery 9 episodes, 1975
- Richard Hurndall
- Â Charles Wayman 8 episodes, 1975
- Tom Criddle
- Â Sir Norman Denison 6 episodes, 1975
- Noel Johnson
- Â Sir Charles 4 episodes, 1975
- John Line
- Â Atkins 4 episodes, 1975
- Maurice Roëves
- Â McGraw 3 episodes, 1975
- Peter Godfrey
- Â Hendricks 3 episodes, 1975
- Jean Anderson
- Â Mrs. Douglas 2 episodes, 1975
- William Wilde
- Â Ron Denny 2 episodes, 1975
- Ronald Leigh-Hunt
- Â John Irvin 2 episodes, 1975
- David Millett
- Â Crewman 2 episodes, 1975
- Judi Lamb
- Â Secretary 2 episodes, 1975
- Isobil Nisbet
- Â Sally / ... 1 episode, 1975
- Kate Coleridge
- Â Frankie 1 episode, 1975
- Ed Bishop
- Â Patterson 1 episode, 1975
- Paul Chapman
- Â Sarratt 1 episode, 1975
- Mike Pratt
- Â Jack Johnson 1 episode, 1975
- Alexander Davion
- Â Henri Leclerc 1 episode, 1975
- Derek Anders
- Â Weston 1 episode, 1975
- Peter Halliday
- Â Dave Lincoln 1 episode, 1975
- Sean Caffrey
- Â Evans 1 episode, 1975
- Tom Watson
- Â Leonard Robertson 1 episode, 1975
- Anthony Roye
- Â Chairman 1 episode, 1975
- David Allister
- Â Tim Hale 1 episode, 1975
- Ray Roberts
- Â Master Mariner 1 episode, 1975
- Richard Warwick
- Â Peter Webber 1 episode, 1975
- Stuart McGugan
- Â Alan Miller 1 episode, 1975
- Bruno Barnabe
- Â 1st Director 1 episode, 1975
- James Copeland
- Â Willie Baxter 1 episode, 1975
- Tony Sibbald
- Â Driller 1 episode, 1975
- Sally Lahee
- Â Rachel McAllister 1 episode, 1975
- Lawrence Davidson
- Â Purvis 1 episode, 1975
- Alison Steadman
- Â Paula Webber 1 episode, 1975
- Barry Jackson
- Â Tom Lawler 1 episode, 1975
- Michael Sheard
- Â John McAllister 1 episode, 1975
- Willoughby Gray
- Â 2nd Director 1 episode, 1975
- Oliver MacGreevy
- Â Cormack 1 episode, 1975
- Leon Lissek
- Â Randall 1 episode, 1975
- Oliver Maguire
- Â Dave Brewer 1 episode, 1975
- Franco De Rosa
- Â Angelo 1 episode, 1975
- John Graham
- Â Bateson 1 episode, 1975
- David Bannerman
- Â Radio Operator 1 episode, 1975
- Wilfred Carter
- Â Calvert MP 1 episode, 1975
- Lloyd McGuire
- Â Immigration Official 1 episode, 1975
- Molly Weir
- Â Molly McLeod 1 episode, 1975
- Joe Powell
- Â Mate 1 episode, 1975
- Terence Lodge
- Â Dr. Porton 1 episode, 1975
- Peter Davidson
- Â Skipper 1 episode, 1975
- Frank Coda
- Â Carlo 1 episode, 1975
- Paul Kermack
- Â Bill Gordon 1 episode, 1975
- Fidelma Murphy
- Â Mrs. McGraw 1 episode, 1975
- Harry Waters
- Â Charlie Poole 1 episode, 1975
- Robert Sansom
- Â Board Member 1 episode, 1975
- Sarah Sutton
- Â Amanda Fraser 1 episode, 1975
- Sean Lynch
- Â Jimmy Bryant 1 episode, 1975
- Ray Marioni
- Â Franco 1 episode, 1975
- John Kelland
- Â Pilot 1 episode, 1975
- Ralph Ball
- Â Geologist 1 episode, 1975
- William Dysart
- Â Bill Gray 1 episode, 1975
- John Hallet
- Â Plimsoll 1 episode, 1975
- Terry Bale
- Â Mate 1 episode, 1975
- James Boyce
- Â Russian Seaman 1 episode, 1975
- Tim Meats
- Â Smith 1 episode, 1975
- John Rolfe
- Â Burton 1 episode, 1975
- Derek Crewe
- Â Harry Roberts 1 episode, 1975
- Denis Cleary
- Â Radio Operator 1 episode, 1975
- Colin Thomas
- Â Baistow 1 episode, 1975
- Harry Walker
- Â Landlord 1 episode, 1975
- Richard Henry
- Â Jock 1 episode, 1975
- David Masterman
- Â Andrew Laurie 1 episode, 1975
- Craig Ross
- Â Jock 1 episode, 1975
- David Hargreaves
- Â Henderson 1 episode, 1975
- Jon Glover
- Â Lorry Driver 1 episode, 1975
- Dominic Allan
- Â Desk Sergeant 1 episode, 1975
- Phil McCall
- Â Pharic McPhee 1 episode, 1975
- Jimmy Mac
- Â Commissionaire 1 episode, 1975
- Willie Joss
- Â Trawlerman 1 episode, 1975
- Alexander John
- Â Chairman of Meeting 1 episode, 1975
- Paul Antrim
- Â Jones 1 episode, 1975
- Patrick Westwood
- Â Police Inspector 1 episode, 1975
- Joby Blanshard
- Â George Prentice 1 episode, 1975
- Bill Denniston
- Â Trawlerman 1 episode, 1975
- John Yule
- Â Radio Operator 1 episode, 1975
- Tom Veitch
- Â Minister 1 episode, 1975
- John Campbell
- Â Ben 1 episode, 1975
- Danny Lyons
- Â Helmsman 1 episode, 1975
- Fred Haggerty
- Â 1st Friend 1 episode, 1975
- Jay Neill
- Â Harrison 1 episode, 1975
- Rocky Taylor
- Â 2nd Friend 1 episode, 1975
- David Mowat
- Â Mackie 1 episode, 1975
- Simon Clarke
- Â Bill 1 episode, 1975
- Ian Elliot
- Â Man on Phone 1 episode, 1975
- Boyd MacKenzie
- Â Assistant 1 episode, 1975
- William Connell
- Â Hospital Porter 1 episode, 1975
- Hugh Martin
- Â Van Praag (uncredited) 1 episode, 1975
- David Wild
- Â Radio Operator (uncredited) 1 episode, 1975
- Lyn Taylor
- Â Barmaid (uncredited) 1 episode, 1975
