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Radioman – ‘Radio’ to his friends and assorted film stars - is the formerly homeless New York movie obsessive who's worked with the likes of Ben Stiller, Matt Damon and Martin Scorsese.

This rough-edged doc shines a light on his accidental cameo-based screen career, built from a disarming toothy-grinned openness, a mysterious knowledge of what's shooting and when, and a brazen attitude towards the craft services van.