Dirty Bertie - the boy with nose-pickingly disgusting habits - is back another helping of comic chaos.
David Roberts worked as a fashion illustrator in Hong Kong before becoming a children's books illustrator. He has worked with a hugely successful list of authors including Philip Ardagh, Julia Donaldson and Georgia Byng. In 2006 David won a gold award in the Nestle Children's Book Prize for Mouse Noses on Toast. Alan MacDonald dreamed of becoming a professional footballer when he was a child, but then he won a pen in a writing competition and his fate was sealed. Alan has since written over sixty children's books, including the Troll Trouble series. He also writes for TV, including the hugely popular Horrid Henry on CITV.