A documentary with only a first name tells you a lot. In marketing terms it says you should know who this person is, someone with a unique selling point. Amy Winehouse died in 2011, her memory fading, but there’s lots of images in this dramatic retelling of her life and loves, and they are not of the Princess Diana variety of burning candles and flickering flames. No less that jazz great Tony Bennett, who we see working with Amy here, said ‘she...