| Episode credited cast: |
 | Tommy Cannon | - | Himself |
 | Bobby Ball | - | Himself |
 | Eric Sykes | - | Himself / Poirot |
 | Jill Gascoine | - | Ilsa |
| Mari Wilson | - | Herself - Musical Guest (as Mari Wilson with The Wilsations) |
| Renee & Renato | - | Themselves - Musical Guests |
| Maggie Henderson | - | Mademoiselle |
| John Dixon | - | Murder Victim |
| Rest of cast listed alphabetically: |
| Val Guest | - | Himself - The Boys in Blue VT (archive footage) |
| Hilary Lester | - | Herself - Renee & Renato (as Renee & Renato) |
| Renato Pagliari | - | Himself - Renee & Renato (as Renee & Renato) |
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