De film gaat over drie uitstekend op elkaar ingespeelde oplichters die proberen een diplomaat te belazeren. Silas, Bob en Liz zijn het onbetrouwbare trio dat in New York, Beiroet en Londen toeslaat.
Nee, helaas is Only When I Larf nog niet beschikbaar op Netflix in Nederland.
| Writing | Len Deighton | Novel |
| Directing | Basil Dearden | Director |
| Writing | John Salmon | Screenplay |
| Camera | Roy Ford | Camera Operator |
| Production | Len Deighton | Producer |
| Costume & Make-Up | Beatrice Dawson | Costume Designer |
| Camera | Anthony B. Richmond | Director of Photography |
| Sound | Brian Holland | Dialogue Editor |
| Art | John Blezard | Art Direction |
| Production | Hugh Attwooll | Associate Producer |
| Editing | Fergus McDonell | Editor |
| Sound | Sid Squires | Sound Recordist |
| Costume & Make-Up | Freddie Williamson | Makeup Artist |
| Costume & Make-Up | Barbara Ritchie | Hairdresser |
| Production | Brian Duffy | Producer |
| Art | Jack Holden | Set Dresser |
| Production | Mac Davidson | Production Manager |
| Editing | Nicholas Napier-Bell | Assistant Editor |
| Sound | Doug E. Turner | Sound Recordist |
| Directing | John Peverall | Assistant Director |
| Sound | Dino Di Campo | Sound Editor |
| Production | Timothy Pitt Miller | Location Manager |
| Sound | Ron Grainer | Original Music Composer |
| Directing | Susan Dyson | Continuity |
