A United Kingdom is a 2016 British biographical romantic drama film directed by Amma Asante and written by Guy Hibbert, based on the true-life romance between Sir Seretse Khama and his wife Ruth Williams Khama. David Oyelowo and Rosamund Pike portray Seretse and Ruth, respectively.

What's the best answer to this question: is the film a united kingdom based on a true story?
yes