In the scenes showing Byron's London club, the poet's own dining table and chairs were used.
Before the film was released, the US announced they would not allow the film to be screened there because of the relationship between Byron and his half-sister, even though it was not featured in the film. Sydney Box later heard a radio play about Byron, "The Trial of Lord Byron" by Laurence Kitchin which he thought would tie up some loose ends of the film. It consisted of Byron being hauled before a celestial court and forced to justify his actions. Box bought the rights to the radio play and had David MacDonald shoot 22 minutes of retakes in two days.
The film was announced in 1945 by Two Cities with Eric Portman to play the title role (Portman had played Byron on stage). Stewart Granger was mentioned as another possibility. The film was to be written, produced, and directed by Terence Young based on the books by Peter Quennell, "Byron: The Years of Fame" and "Byron in Italy." The project was not made but was re-activated when Sydney Box took over Gainsborough Studios in 1946. Box had been considering a film based on Percy Bysshe Shelley but was also enthusiastic about making one on Byron, who Box admired. He assigned the project to producer Aubrey Baring and director David MacDonald. They reduced Young's script by half, but Box was still dissatisfied with it.
Working with Gainsborough script adviser Paul Holt, Box reconfigured the film to consist of a series of flashbacks about episodes in Byron's life. Box decided this approach was too derivative of Citizen Kane (1941) and made Byron's presence in the film too insubstantial. He then decided to focus the script on Byron's relationship with Teresa Guiccioli but changed his mind after Mai Zetterling who was playing that part, was no longer available.