The actor that played the prosecution counsel in "The Execution of Gary Glitter" appeared in a 2001 horror film directed by the Hughes brother and loosely based on a novel by what two people?
Terence Harvey:  He also appeared in "From Hell", "Johnny English", "Hollyoaks", "The White Countess," "Mr. Selfridge, Hustle", "Downton Abbey, and The Damned United." From Hell (film): From Hell is a 2001 American mystery horror film directed by the Hughes brothers and loosely based on the graphic novel "From Hell" by Alan Moore and Eddie Campbell about the Jack the Ripper murders.
Alan Moore and Eddie Campbell