Lloyds of London traces the rise to prominence of the venerable British insurance company, as seen through the eyes of fictional 19th-century Londoner Jonathan Blake (Tyrone Power, in his first starring role). A lifelong friend of naval hero Lord Nelson, Blake puts his job (and the future existence of Lloyds) on the line when he announces Nelson's victory at Trafalgar -- before it takes place.
For those not interested in policies and premiums, the script serves up a romance between Blake and the lovely Lady Elizabeth (Madeleine Carroll), the unhappily married spouse of snotty aristocrat Lord Everett Stacy (George Sanders).
Among the few real-life historical personages depicted in the film is Lloyds founder John Julius Angerstein, played by Sir Guy Standing. A box-office bonanza, Lloyds of London proved that 23-year-old Tyrone Power could carry a picture -- and that the recently-formed 20th Century-Fox was truly a major Hollywood studio.