March's biological parents were a black South African father from Lesotho and a white English mother.
She was adopted by the Earl and Countess of March and Kinrara, who later became the Duke and Duchess of Richmond.
Because of her race, at the time the adoption caused a stir within the peerage and the future Duke and Duchess were vilified by some for "sullying the aristocracy", as March herself described it.
March's television screen credits include Coronation Street, Albion Market, Common As Muck, Goodnight Sweetheart, Casualty, William and Mary, Doctors, Strictly Confidential, The Bill, London's Burning, Waking the Dead, Death in Paradise, Agatha Raisin, Desmond's and Emmerdale.
However, as a result of a Royal Warrant dated 30 April 2004, all children are now automatically entitled to the same styles and courtesy titles.