A hardback book brimming with comic stories about five awful girls and boys: Sara Soffa, who spends so much time on the sofa that she is turning into one, Guto Glafoerio, the never-ending dribbler, big sister Beti Bw-hw, the tell-tale and many more. Manon Steffan Ros's Welsh adaptation of The World's Worst Children, David Walliams' unique take on the classic cautionary tale.