Being Frank: the Chris Sievey Story is the official documentary about Chris Sievey and his alter ego, Frank Sidebottom (who was the subject of a fictional movie called "Frank" starring Michael Fassbender a few years back).
Update - Although the film has not yet been released in the UK, it's available to stream in the US on Amazon Prime: http://a.co/d/6PWvc0x
Update - Although the film has not yet been released in the UK, it's available to stream in the US on Amazon Prime: http://a.co/d/6PWvc0x