She was a recipient of the Tir na n-Og Award presented by the Welsh Books Council, and of eisteddfod prizes.
Irma Evans was born in Loughor, in Glamorgan, close to the border with Carmarthen.
Chilton's first book, Take Away The Flowers & Fuller's World, combined two science fiction stories about a pilot character named Tom Davies; Heinemann published the volume in 1967.
They include the novels String of Time (1968, a time-travel story later retitled Nightmare (1972),[5][6] Goldie (1969, about a "calf-like" space creature who lands on an English farm),[7] The Time Button (1970), Strangers Up the Lane (1971), Rhwng cwsg ac effro (1975),[8] The Magic Cauldron and Other Folktales (1976),[9] A Spray of Leaves (1977),[10] The Witch (1979),[11] The Prize (1983),[12] Y Wobr (1984),[13] and Y Peiriant Amser (1986, about time-travelling children).
[2][15] Irma Evans married a chemist, Harry Chilton; they had two children, Dafydd and Rhiannon.