Chris Larkin played Berenger, and in real life he is the brother of Toby Stephens and their mother is Dame Maggie Smith!!
Larkin (changed his name) really resembles his mother!
Toby Stephens' birth mother is Dame Maggie Smith, and his step mother is Patricia Quinn, who played Magenta in the original "Rocky Horror Picture Show" and Livilla in "I, Claudius" in 1976. His father was the late, great Sir Robert Stephens from Billy Wilder's "The Private Life of Sherlock Holmes." His wife, actress Anna-Louise Plowman, plays Eleanor Guthrie's chambermaid, Mrs. Hudson.
Furthermore: Louis Barnes, who played Miranda Barlow, is married to actor, Nick Boraine, who played Lord Peter Ashe, Governor of the Carolina Colonies.