The makers of this documentary about singer-songwriter Amy Winehouse, who died of alcohol poisoning four years ago at the age of 27, would like us to know the “real” Amy. In a melancholy way, it is an intriguing proposition. Winehouse belonged to a generation that is used to capturing and sharing experiences on phones and cameras. Performance is not confined to studio or stage. So, “real” – what is that? Can it be conveyed in two hours of skilfully assembled and editorialised material? Drawing on an extraordinary range of archive, including amateur footage, news reports, session recordings and even telephone answering-machine messages, the film overlays picture and sound with interviews (both old and new with the speakers all out of vision; there are no talki