Black is married to Julia Burgess, with whom he had twin boys George and Max in 2006. Black also has a daughter, Isabelle from his previous marriage to Elsa Devassoigne. Despite being born in Gosport, and attending the prestigious Portsmouth Grammar School, Black is a supporter of Southampton F.C.. In August 2014, Black was one of 200 public figures who were signatories to a letter to "The Guardian" opposing Scottish independence in the run-up to September's referendum on that issue.