To make Being Frank: The Chris Sievey Story, director Steve Sullivan conducted a decades-spanning quest to uncover and understand the man behind Frank Sidebottom, the cult comic figure with the papier-maché head. On Sight & Sound’s website, he tells Leigh Singer all about it, and shares some of the material he uncovered:

https://www.bfi.org.uk/news-opinion/sight-sound-magazine/features/being-frank-chris-sievey-story-frank-sidebottom-steve-sullivan-making-of-archive