Kirsty Young's castaway is the children's author Francesca Simon.
Educated at Yale and Oxford she initially thought she'd pursue an academic life - but within weeks of her son's birth, found that ideas for children's stories started flowing. She's now written twenty books featuring her creation Horrid Henry and they sell in their millions.
She sees Horrid Henry as sitting within the long tradition of anarchic characters in children's literature. She says: "Everyone responds to Henry because I think everyone feels - however conventional they seem on the outside - that they are rebellious and unconventional, and Henry really taps into that."
Producer: Leanne Buckle.