Ambassador is a British television series produced by the BBC written by Hugh Costello. The series starred Pauline Collins in the title role as Harriet Smith, the new British ambassador to Ireland and dealt with the personal and professional pressures in Harriet's life, as well as wider political themes. Other notable cast members were Denis Lawson and Peter Egan. The Ambassador" follows the private and political problems facing the UK ambassador to Ireland, Harriet Smith . She has to deal with international political skullduggery, cases, Anglo-Irish relations as well as the affairs of her family. She is assisted by a team including John (Denis Lawson - " "Local Hero"), an MI5 agent in charge of security as well as unofficial intelligence gathering. Disc 2 consists of Nine Tenths of Law; and A Cluster of Betrayals.