Prue Leith has revealed that she had a 13-year affair with her husband Rayne Kruger, who was married to South African actress Nan Munro at the time.The Great British Back Off judge, 83, shared that at the time of the affair both Rayne and Nan were family friends, with the latter being her mum's, actress Margaret Inglis, best friend. And perhaps even more bizarrely, despite the affair, Prue and Nan remained friends until the actress's death in 1992. Rayne died in 2002, at the age of 80, with Prue revealing the affair ten years later in her autobiography Relish: My Life on a Plate.