Marsha Fitzalan/Lady Marcia Mary Josephine Fitzalan Howard is a British actress best known for her portrayal as Sarah B'Stard in The New Statesman. She is the third daughter of Miles Fitzalan-Howard, ...

An MP's marriage is threatened by blackmail, while his best friend, a bachelor, finds his independence threatened by the charms of the MP's sister.

It's surprising (and questionably depressing) how relevant this particular episode still is given the corruption in politics and the way deals are made with politicians friends and associates.