Children's authors at the book festival in Hay-on-Wye.
The author introduces his latest book.
Boyce introduces his latest book, The Astounding Broccoli Boy
How the author's childhood summers on a Scottish island prepared her for writing career.
Stories of dragon-like creatures from the author's childhood on a remote Scottish island.
How imaginary maps were used by Stanley Kubrick and RL Stevenson, and by Cowell herself.
The author talks about his career with live input from illustrator Chris Riddell
