All of which may sound too good to be true, but Plant, 69, is no crackpot. Professor of geochemistry at Imperial College London, where she specialises in environmental carcinogens, she is highly regarded in her field, having been awarded a CBE in 1997 for her services to earth science; and her approach to cancer is supported by some eminent scientists. Her latest book, co-written with Mustafa Djamgoz, professor of cancer biology at Imperial, has a foreword from Prof Sir Graeme Catto, president of the College of Medicine, who describes its findings as “illuminating… even, at times, shocking” but all backed up by scientific research.