Claire Foy and Paul Bettany are set as the stars of Amazon and BBC One’s “A Very British Scandal,” a followup to the Hugh Grant-led “A Very English Scandal.” Written by Sarah Phelps (“The Pale Horse,” “Dublin Murders”), the three, 60-minute episodes focus “on the divorce of the Duke (Bettany) and Duchess of Argyll (Foy), one of the most notorious, extraordinary and brutal legal cases of the 20th Century.” Per Amazon, “Famed for her charisma, beauty and style, Margaret, Duchess of Argyll, dominated the front pages as a divorcee featuring accusations of forgery, theft, violence, drug-taking, secret recording, bribery, and an explicit polaroid picture all played out in the white-hot glare of the 1960s media. ‘A Very British Scandal’ turns this scandal inside out in order to explore the social and political climate of post-war Britain, looking at attitudes toward women, and asking whether inst