Film about Botswana's first president to open at London Film Festival

'A United Kingdom' tells the love story of Seretse Khama and London clerk Ruth Williams.

President Sir Seretse Khama and First Lady of Botswana from 1966 to 1980 Ruth Williams. Picture: Twitter

JOHANNESBURG - A film based on the love story of Botswana's first president King of Bechuanaland (modern Botswana), Seretse Khama and British office clerk Ruth Williams, will open at the BFI London Film Festival in October.

Based on the book Colour Bar by Susan Wiliams, A United Kingdom stars English actor David Oyelowo who will play Khama and Rosamund Pike who takes on the role of Ruth.

Khama and Williams married in 1947 in the face opposition from their families, the British and South African governments.

Ama Asante, who is also the director of Belle, will be the first black woman to open the festival which marks its 60th celebration this year.