Author Chris Riddell has won his fifth Nestle Children's Book Prize with his book Ottoline and the Yellow Cat.
Riddell received his gold medal in the six to eight-year-old category during a ceremony at the British Library.
In previous years Riddell, who is also a successful illustrator and political cartoonist, has won gold and silver medals for his work.
The prize, now in its 23rd year, celebrates the nation's best children's books as voted for by children.
Matt Haig won the top prize in the nine to 11-year-old category with his fantasy tale Shadow Forest.
The 31-year-old's book is an atmospheric tale of "one-eyed trolls, murderous truth pixies, witches and humans who turn into rabbits".
When a Monster is Born by Sean Taylor and Nick Sharratt scooped the gold prize in the under-five category.
Young judges
Riddell, who has sketched cartoons for several publications such as The Observer and The New Statesman, last scooped the gold medal award in 2004.
He was awarded the top prize for his illustrations to Paul Stewart's Fergus Crane.
His other medals were awarded for The Emperor of Absurdia and Hugo Pepper and Corby Flood with Paul Stewart.
Sam Fulton from Nestle said: "I'd like to thank the thousands of school children who took part in this year's Nestle Children's Book Prize and especially our young judges who worked so hard to choose the winners."
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