[1] Relatives of James Chichester-Clark, Clark's family had been settled in Upperlands in County Londonderry for generations, where they owned a substantial linen mill.
In 1959 Clark resigned from the Colonial Service to enter Parliament as Ulster Unionist MP for Antrim North.
Clark chaired the Conservative MPs' East Africa Committee in 1963-65 and was a part of the British Parliamentary delegation to the Council of Europe and the Western European Union from 1962 to 1965.
Clark's background in the Colonial Service and his abiding interest in East Africa led to his appointment as an electoral observer.
He married Penelope (d 1994), daughter of Group Captain Nicolas Tindal-Carill-Worsley and they had three children: Christabel (b 1973, m Dario Sbrocca), Camilla (b 1975, m Alasdair Spink) and Jamie (b 1979, m Kate Sinton).