[6] Morant had a long television and theatrical career, first as Flashman in a BBC adaptation of the Thomas Hughes novel, Tom Brown's Schooldays (1971), and a starring role in Thames Television's Armchair Theatre play Verité (1972) and a regular role as Dr Dwight Enys in the BBC series Poldark (1975).

[7][8] Morant also appeared in several BBC serials, including adaptations of Walter Scott's Woodstock (1973), as the future Charles II, and The Talisman (1980), as Conrade of Montserrat.

[7] He played Maximilien Robespierre in The Scarlet Pimpernel (1982), and he later played Mervyn Bunter, the valet of Lord Peter Wimsey, in A Dorothy L. Sayers Mystery, the BBC's 1987 productions of Strong Poison, Have His Carcase and Gaudy Night (all based on Dorothy Sayers's original novels).

[12] His stage appearances included a starring role in Noël Coward's Private Lives at the Theatre Royal, Bath in 1984.

[6] In 2005 he became the sole owner of an established company specialising in carpets and fine textiles,[16] headquartered in Notting Hill, London.