Byrne's other works include the novel "Groupie" (1969, co-written with Jenny Fabian), the BBC "Wednesday Play" "Season of the Witch" (1971), and the scripts for the films "" (1972, co-written with original author Spike Milligan and Norman Cohen), and "Rosie Is My Relative" (1976). He was script editor of the TV series "All Creatures Great and Small" (1976, 1978, 1985, 1988–1990), writing 29 episodes, and also produced scripts for "One by One" (1987). Byrne was the creator of the TV drama series "Heartbeat" (which was loosely based on the "Constable" books by Nicholas Rhea), writing 23 episodes for 17 series between 1992 and 2005. He also created and wrote for "Noah's Ark" (1997–98).