Born in Corby, Northamptonshire, England, Ferris provided scores for various low budget British horror films during the late 1960s and early 1970s.
[1] In 1965 he was seen as John Mannering's sidekick David Marlowe in The Baron before his character was replaced by Sue Lloyd at the insistence of American television executives.
[4][5] He is probably best known for his rousing score for Michael Reeves' Witchfinder General (1968), in which he also appeared in a bit part under the pseudonym "Morris Jar" (in tribute to composer Maurice Jarre).
[6] Due to convoluted rights issues, Ferris's critically acclaimed music had been wiped from the soundtrack for the film's U.S. videotape and laserdisc releases for decades, replaced by a generic synthesizer score by Kendall Schmidt.
[7] In 2007 the film was released on DVD under the MGM Midnite Movies banner by 20th Century Fox Home Entertainment, with Ferris's score intact.