Lee Miller’s unbelievable life: From Hitler’s bathtub to tomato soup cake

Photographer Lee Miller, the subject of a major new film starring Kate Winslet, used her camera lens to pioneer a new way of seeing conflict. Later, broken by what she saw during the Second World War, she found respite in a Sussex farmhouse called Farleys, where she would begin her surreal next act and her son Antony Penrose would discover her secrets, writes Jessie Thompson