The document discusses the roles of key jobs in film production that are credited in opening credits. It provides descriptions of common roles such as director, screenplay writer, producer, executive producer, main cast, director of photography, film editor, music composer, and more. It also profiles two prominent UK film production companies - Aardman Animations and Heyday Films - and notes some of their successful past film credits. Finally, it provides brief definitions and examples of production and distribution roles in the film industry.