| Name | Character | Episodes |
|---|---|---|
| Barry Stanton | Strawson | 5 |
| Stuart Wilson | Peter Carter | 5 |
| Robert Urquhart | Sir Robert Falcon | 5 |
| Robert Morley | Lord Godmanchester | 5 |
| Maurice Denham | Dr Edwin Leacock | 5 |
| Marius Goring | Dr Emile Englander | 5 |
| John Phillips | Dr Charles Langley-Beard | 5 |
| Roland Culver | Lord Oresby | 5 |
| Toria Fuller | Martha Carter | 5 |
| Richard Wordsworth | Matthew Price | 5 |