- His wife is a teacher, and they have two daughters: Daisy, born in 1996 and Holly, born in 2001.
- Twice portrayed John Lennon on film, in The Hours and Times (1991) and Backbeat (1994).
- Has played both Arthur Conan Doyle (in Finding Neverland (2004)) and one of his most famous characters from the Sherlock Holmes canon, Dr. Watson (The Hound of the Baskervilles (2002) and Sherlock Holmes and the Case of the Silk Stocking (2004)).
- Has twice played a lackey of Ralph Fiennes. In The End of the Affair (1999), he plays a private detective hired by Fiennes's character to spy on Julianne Moore. In Harry Potter and the Sorcerer's Stone (2001), he played Professor Quirrell who allows his body to be used as a host for the spirit of Lord Voldemort (where Hart also provided the facial structure for the CG head of the role at the end of the film) - who is played in the flesh by Fiennes, beginning with Harry Potter and the Goblet of Fire (2005).
- His surname at birth was Davies but he adopted "Hart" as his last name from his Everyman Theatre School associate Barbara Hart.
- Lifelong friend of fellow Liverpudlian actor David Morrissey.
- Resides in Crouch End, London, England. (2004)
- During the Penseive sequence of Harry Potter and the Deathly Hallows: Part 2 (2011), there is a flashback (archive footage of Harry Potter and the Sorcerer's Stone (2001) is shown) of Severus Snape listening to Professor Quirrell (an uncredited Hart with his face turned away). This appearance makes Hart the only cast member to only appear in the first and last "Harry Potter" films.
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