Curiosidades

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 Las horas y los tiempos (1991) and Backbeat (1994).

Has played both Arthur Conan Doyle (in Descubriendo Nunca Jamás (2004)) and one of his most famous characters from the Sherlock Holmes canon, Dr. Watson (El perro de los Baskerville (2002) and Sherlock Holmes y el caso de la media de seda (2004)).

Has twice played a lackey of Ralph Fiennes. In El fin del romance (1999), he plays a private detective hired by Fiennes's character to spy on Julianne Moore. In Harry Potter y la piedra filosofal (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 y el cáliz de fuego (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 y las Reliquias de la Muerte: Parte 2 (2011), there is a flashback (archive footage of Harry Potter y la piedra filosofal (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.