The elder of two boys, he has a younger brother Robin. He and Kate Winslet, whom he met on the set of Hideous Kinky, married on 22 November 1998 in Reading, Berkshire, Winslet's hometown. They had a daughter, Mia Honey Threapleton Winslet (born 12 October 2000 in London). However, the two separated in September 2001 and divorced on 13 December 2001.
His first work as a Director (and writer) was the film Extraordinary Rendition, starring Omar Berdouni and Andy Serkis, which premiered at the 2007 Locarno Film Festival.