In the TV movie Goldeneye: the Secret Life of Ian Fleming (1989), Marsha plays Loelia Ponsonby, a friend of Fleming's whose name he used for James Bond's first secretary, also called Loelia Ponsonby. The real Loelia later married the second Duke of Westminster, a distant cousin of Marsha's, while the fictional Loelia was also married off at the same time.
Marsha was Miss Marcia Fitzalan-Howard until 1975, when she was twenty-two. Her father, Major-General Fitzalan-Howard, then inherited the title of Duke of Norfolk from a distant cousin. Strictly speaking, this made his daughter Lady Marcia Fitzalan-Howard, but she was already an aspiring actress and decided to use the name Marsha Fitzalan instead.
In 2006, Rik Mayall and Marsha Fitzalan reprised their television roles as Alan B'stard MP and his wife Sarah in a touring stage production called The Blair B'Stard Project, bringing the B'stard saga bang up to date.