The spokesman added that Mrs Campbell would not be commenting. Two previous Bake Off winners sprang to her defence, however. Last year’s winner, Nancy Birtwhistle, told the Telegraph: “As long as you didn’t have formal qualifications and had never worked in food I don’t think there was anything to stop you having been on courses. If you’re a passionate baker you’re going to want to know more. You’re not just going to pick it up in your kitchen.”