Kristen Scott Thomas says that is was the chance to work with Nicolas Winding Refn that drew her to Only God Forgives.
The actress admits that films with such huge amounts of violence really are not to her taste but she was excited to work with the director and take on a role she had never tackled before.
Speaking to The Playlist the actress said: "This kind of film is really not my thing," The Playlist quotes Scott Thomas as saying. "Films where this kind of violence happens, I don't like watching them at all."
"When I'd seen Bronson - I'd seen it before I met him - I thought it was the most beautiful thing. There was something deeply emotional and troubling there which appealed to me enormously.
"When I first read the script, I was excited to play someone who is as far away from the upper class thing that English people seem to love to see me in.
"I really just thought of how interesting it would be to be playing this wild, savage person, and working with Nicolas."
Scott Thomas plays the mother of Ryan Gosling's character and a respected figure in the criminal underworld of Bangkok.
The movie is competing for the Palme d'Or at the Cannes film festival but has so far split the critics and been booed by audiences.