Dirty Bertie has his very own joke book, packed full of disgusting jokes that are guaranteed to have you laughing your socks off!
Why do apples on trees remind Bertie of bogeys?They're fresh, green and ready to pick!
What wears a coat in the winter and pants all summer?A dog!
Why did the toilet paper roll down the hill?To get to the bottom!CPSIA choking hazard - No choking hazard warning necessary|EU Toy Safety Directive - No warning
David Roberts worked as a fashion illustrator in Hong Kong before becoming one of the UK's foremost children's illustrators. He has worked with writers including Philip Ardagh, Georgia Byng and former Children's Laureate Julia Donaldson. David won a Gold Award in the Nestle Children's Book Prize for Mouse Noses On Toast in 2006, and was shortlisted for the CILIP Kate Greenaway Medal for The Dunderheads in 2010 and Tinder in 2015. Alan MacDonald dreamed of becoming a professional footballer, but when he won a pen in a writing competition his fate was sealed. Alan has written over eighty children's books, which have been translated into many languages and won several awards. Alan also writes for TV.