In new Netflix thriller I Came By, cuddly British actor Hugh Bonneville shows his dark side as a retired judge concealing a horrifying secret, which threatens to unravel when politically-motivated graffiti artists break into his home.

Director Babak Anvari and the film's star George MacKay discuss the fun of seeing a national treasure in an entirely different light.

I Came By is in cinemas now and on Netflix from 26 August.