He went on to arrange the score for the London stage and film adaptation (The Rocky Horror Picture Show) as well as its follow-up Shock Treatment, and then worked with O'Brien on another, as yet unproduced, sequel, Revenge of the Old Queen.
[4] His other 1970s film scores included Galileo (1975), The Romantic Englishwoman (1975), Aces High (1976), and the remake of The Lady Vanishes (1979).
[5] In the 1980s, Hartley worked primarily in television, including providing the music for the 1986 Doctor Who story Mindwarp,[6] and TV movie productions, such as Kennedy (1983), Hitler's SS: Portrait in Evil (1985), Mandela (1987) and Rules of Engagement (1989).
However he also composed for film, including the Nicolas Roeg film Bad Timing (1980), Bad Blood (1982), The Trout (1982), The Return of Captain Invincible (1983), Sheena (1984) (for which Hartley was nominated for a Golden Raspberry Award), Dance with a Stranger (1985), Parker (1985), The Good Father (1985), Consuming Passions (1988) and Tree of Hands (1989).
[7] In the 1990s he provided the scores for many films including Afraid of the Dark (1991), The Railway Station Man (1992), The Secret Rapture (1993), Princess Caraboo (1994), Victory (1995), An Awfully Big Adventure (1995, which was released on CD), Rough Magic (1995), Stealing Beauty (1996), Rogue Trader (1999), and Alice in Wonderland (1999), in which he won an Emmy Award for Outstanding Music Composition for a Miniseries or a Movie (Dramatic Underscore).