Born in Camberwell, London, England on February 27, 1924, died in Taunton, Somerset on December 17, 2005, Leonard Charles Trebilco was a very prolific light music composer. Many recordings of his works wound up in production music archives like Associated Production Music (APM). He worked under the pseudonym Trevor Duncan most of the time (starting while he was under the strict rules of the BBC's composers), and he composed right up to his death, as well as being the local chruch organist.
He composed mostly for the BBC's radio plays and for newsreels. (more info here and here)
I have found two pseudonyms under which Trebilco worked:
Trevor Duncan (his most famous pseudoym)
Steve Bretton
Brett Wilson
Plus, some selected works of his:
"Eastside Story" - versions A & B - (on KPM 380, "Archives Vol. 9"--1940s & 50s)
"Eastside Rebel" (on KPM 380, "Archives Vol. 9"--1940s & 50s)
"Lady in Love" (on Guild Light Music CD 5124, "The Golden Age of Light Music: The Hall of Fame - Volume 2")
"High Heels" (on Guild Light Music CD 5124, "The Golden Age of Light Music: The Hall of Fame - Volume 2")