Willy Nilly is off to the shop to buy a cabbage. 'Yuk' he says. 'Don't say that, Willy Nilly' says his mum. So Willy Nilly tries very hard to say the right thing - but somehow he always says it just at the wrong moment. 'Don't say that, Willy Nilly!' he's told. Will he ever get it right? Illustrated by David Roberts, award-winning illustrator of the 'Dirty Bertie' titles.