Lyn Gardner is theatre critic for the Guardian and goes to the theatre five or six times a week. But she's still managed to write several children's books, including the very successful OLIVIA series (Nosy Crow). She lives by Richmond Park. Follow Lyn at or on Twitter: @lyngardner. Ros Asquith is a cartoonist for the Guardian, and has written and illustrated many books. LETTERS FROM AN ALIEN SCHOOLBOY was shortlisted for the Roald Dahl Funny Prize, and THE GREAT BIG BOOK OF FAMILIES, which she illustrated, won the SLA Information Book Award. She's known to a generation of teenagers for her TEENAGE WORRIER books. She lives in North London. Visit Ros at www.rosasquith.co.uk.