 David Jason s most famous film appearance of the 1970 s was opposite Graham Chapman in  The Odd Job  but five years earlier he played the lead role in this very low budget comedy. His character is a daydreamer but he manages to get caught up in an adventure involving the hugely underated Imogen Hassall. There is even an appearance from a pre Darth Vader Dave Prowse although his character closer resembles the one he played in  Callan .