EXCLUSIVE - 'My white gran and black 'Gramps' were outcasts... but their marriage set me free': Stunning granddaughter reveals true love story of British typist who fell for African king in new Rosamund Pike film

EXCLUSIVE: The courageous love story of Tahlia Khama's white grandmother and black grandfather (pictured) - brought to life on the big screen in the film 'A United Kingdom' (right) - has given their granddaughter (right) the freedom to love whom she chooses.The movie re-creates the then-scandalous marriage between Tahlia's African king grandfather Seretse Khama and London office clerk grandmother Ruth Williams in the late 1940s. They married in London but eventually were allowed to return to Africa and Seretse became the first president of newly independent Botswana. Tahlia (left) adored her grandmother Ruth and remembers how she remained 'English until the end'