He was best known as the creator of the BBC's animated television series Roobarb (1974) and Noah and Nelly in... SkylArk (1977).
After leaving Bradbury at age 15 he joined Osborne Peacock, a Manchester advertising agency and later attended art college on day release.
The Roobarb cartoon character is loosely based on Calveley's own dog, a Welsh Border Collie.
Roobarb was directed by Bob Godfrey, the series' music was by John Hawksworth and the stories were narrated by Richard Briers.
The characteristic bouncy wobbly style known as "boiling" was used as Calveley and the other animators did not have enough money to use traditional cel methods and used marker pens on paper instead.