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I've now bought all the books in this series for my 11 year old brother in law who absolutely loves them. We've read some of them together at bedtimes and I cannot count how many times he has re-read them (he's only had them all for a few weeks!)
The stories are imaginative, the characters are interesting and funny, the illustrations are brilliant and it's something unlike anything else out there right now. I'd put these right up there with books from Roald Dahl and Enid Blyton.