Sir Oswald Mosley was devastated by the death of his wife Cynthia on May 16 1933, but later started an affair with her younger sister Lady Alexandra Metcalfe, who was then married to Fruity Metcalfe. This she justified on the grounds that she was "saving" Oswald from his mistress Diana Guinness (whom he started an affair with in 1932, when she was also married). He married Diana anyway in 1936 with Hitler as a witness, but kept the secret from Baba for two years.
Before World War II she earned the sobriquet Baba Blackshirt, and for a while played a murky role as a semiwitting go-between for Oswald Mosley and her other lover at the time, Dino Grandi, Benito Mussolini's ambassador to London, while simultaneously enjoying the romantic devotion of the foreign secretary, Lord Halifax, who was staying at the same Dorchester Hotel as Alexandra and her sister.