Michael Fassbender's chops remain hidden during most of this beguiling tragicomic fable inspired by Jon Ronson's memoir about indie enigma Frank Sidebottom, writes Peter Bradshaw

Frank Sidebottom was possibly the strangest pop star in history. Jon Ronson, who played in his band, and has co-written a film inspired by the character starring Michael Fassbender, remembers Frank's creator Chris Sievey as being even more eccentric than his papier-mache alter ego

From Michael Fassbender's Frank Sidebottom film to a national anthem mash-up