In addition to script writing for the radio series The Archers, Hayles penned a novel based on the soap called Spring at Brookfield (Tandem, 1975) set in the period between the two world wars. His other books included novelisations of his Doctor Who stories, and two horror plays for children, The Curse of the Labyrinth (Dobson, 1976) and Hour of the Werewolf (Dobson, 1976). An original novel entitled Goldhawk (NEL, 1979) was published posthumously.