Sam McKnight is the most renowned hairdresser in the world. It remains written. He has worked for almost five decades in the fashion industry with Linda Evangelista and Cara Delevingne. He "invented" the famous short hairstyle of Princess Diana of Wales and the falsely unkempt hair of Kate Moss. Maybe you can't have Sam do your hair at home, but you can have his products, designed so that you can easily get the hair you want. Who was going to tell you? You, sharing a hairdresser with Kate Moss and Princess Diana...