* The name is misspelled or slightly different. It's worth checking for variations of the name on databases like IMDb.
* The individual might be more known in a specific region or genre. You could try looking for information about them in niche film communities or regional film archives.
* They might not be a well-known public figure. De nombreuses personnes talentueuses pourraient travailler dans les coulisses ou dans de petites productions.
To help me find more information, could you provide me with more context?
* Avez-vous d'autres détails sur Roger Darton, comme le type de projet dans lequel il est impliqué (acteur, réalisation, écriture) ou la période approximative de son travail ?
* Is there a particular source where you saw his name mentioned?
With more information, I might be able to find the specific person you're looking for.