Max Adrian [King Priam] starred in the TV series Up Pompeii!, as Sen. Ludicrus Sextus. This was the source for Loose Cannon. He appeared only in the first series and not in the films.
Also note him in these movies:
Dr. Terror's House of Horrors (1965) .... Dr. Blake (segment "Vampire")
The Devils (1971) .... Ibert
About one photo of King Priam exists, showing him from the side. Costume details are not clear.
___
Barrie Ingham played Prince Paris.
He previously appeared in the Peter Cushing film Dr. Who and the Daleks (1965) as Alydon, leader of the Thals. However, he's wearing heavy drag-queen makeup in that film, making it fairly useless for reference.
He also appeared in:
Danger Man - The Vacation 29 January 1961 (Season 1, Episode 20)





He's not in the episode too much, apart from one long car scene. He turns out to be a baddie.
This was not Loose Cannon's source.
___
James Lynn played Troilus. He had very few other roles, and for once Loose Cannon actually gave up on this character. There are several photos of him with Cressida, shown from a side view, usually from a worm's eye view. Although not the best angles, Loose Cannon used these in their recon.
___
Frances White played Cassandra.
I'm not sure what Loose Cannon's source was, but it shows her as young with long hair.
11 years later, she appeared looking older with her hair up in a bun, in I, Claudius. She's quite excellent in it.
"I, Claudius" .... Julia (2 episodes, 1976)
- Waiting in the Wings (1976) TV episode .... Julia
- A Touch of Murder (1976) TV episode .... Julia
I believe Loose Cannon took a lot of their costumes from I, Claudius.
Frances White also appeared in:
Mary, Queen of Scots (1971) .... Mary Fleming
In May 2009, Doctor Who Magazine published its 22nd Special Issue, entitled 200 Golden Moments. Two actual photos of Cassandra appear, showing her in a tiara/coronet headdress and short hair, as well as "poison spike" shoulder brooches.
Previously, no photos of Cassandra were known to exist, and this look for Cassandra is a surprising one, different from how she appeared in Loose Cannon's recon.
___
Jack Melford played Menelaus. He also appeared in:
Lust for a Vampire (1971) .... Bishop
___
Cavan Kendall played Achilles.
___
Tutte Lemkov (Cyclops) played Kuiju in Season 1's Marco Polo, and Ibrahim in Season 2's The Crusade.
At least one photo of Cyclops exists.
___
Alan Haywood played Hector. Loose Cannon used grabs from The Avengers.
"The Avengers" The Gilded Cage 9 November 1963 (Season 3, Episode 7)
"The Avengers" A Chorus of Frogs 9 March 1963 (Season 2, Episode 24)
A Chorus of Frogs is also, strangely, good reference for Polly in The Macra Terror. There's an actress with an identical hairstyle.