Rosamund Pike thinks she is as "brave" as her 'A United Kingdom' character.

Rosamund Pike

Rosamund Pike

The 37-year-old actress - who has sons Solo, four, and Atom, 23 months, with partner Robie Uniacke - had a home birth because her labour was so quick, just as Ruth Williams, who she portrays in the biographical drama, had her child alone, and admits that though the experience wasn't frightening at the time, she was scared afterwards when she thought about the problems the situation could have posed.

She said: "Ruth gave birth alone, and so did I, at home because I couldn't get to the hospital in time. In the moment you don't think about it, although afterwards I was frightened of all things that could have gone wrong. So I think we have that bravery in common."

Rosamund is "proud" to have worked on the movie, which portrays the relationship between her office worker character and David Oyelowo's Prince Seretse Khama of Botswana, because Hollywood still doesn't show many interracial love stories.

She told Stylist magazine: "You've got a black man falling in love with a white woman and vice versa in the Forties. They are rejected socially, politically and by their families. Nobody wants their marriage to happen. It makes me proud to have brought back their story to more people.

"Even within the film industry, I wish there was colourblindness and that any romantic film could be played by a black actress and a white actor but that's clearly not been the case."

But the star insists the film isn't largely a political statement.

She said: "Aside from any political angle, it's a love story. And at the moment we're really starved of love stories in cinema."