Three-part series "A Very British Scandal" focuses on the divorce of the Duke and Duchess of Argyll, one of the most notorious legal cases of the 20th century. Famed for her charisma, beauty, and style, Margaret Campbell (Claire Foy), Duchess of Argyll, dominated the front pages as the divorce exposed accusations of forgery, theft, violence, drug-taking, bribery, and an explicit Polaroid picture that was to haunt her for the rest of her life.