#1 is C.S. Lewis's The Chronicles of Narnia, the Times Online reports! Harry Potter and the Half-Blood Prince lags at #6. Here are the top twenty books for kids, as polled by Booktrust:

Top 20 children's books

1. The Lion, The Witch and the Wardrobe C. S. Lewis

2. The Very Hungry Caterpillar Eric Carle

3. Famous Five series Enid Blyton

4. Winnie-the-Pooh A. A. Milne

5. The BFG Roald Dahl

6. Harry Potter and the Half-Blood Prince J. K. Rowling

7. The Faraway Tree Enid Blyton

8. The Wind in the Willows Kenneth Grahame

9. Alice in Wonderland Lewis Carroll

10. The Gruffalo Julia Donaldson

11. The Tales of Peter Rabbit Beatrix Potter

12. Charlie and the Chocolate Factory Roald Dahl

13. Matilda Roald Dahl

14. The Secret Garden Frances Hodgson Burnett

15. The Cat in the Hat Dr Suess

16. The Twits Roald Dahl

17. Mr Men Roger Hargreaves

18. A Christmas Carol Charles Dickens

19. Malory Towers series Enid Blyton

20. Peter Pan J. M. Barrie


[Times Online]