While doing my LLM at reading I was of course interacting a bit more socially with the other students than I generally did with students in Systems Engineering where I was a lecturer. I remember a discussion of The Amazing Maurice with one of the others. They claimed it wasn't a children's book. After a bit of back and forth I'm afraid I resorted to proof by authority when they asked me why I thought it was a children's book. "Because PTerry said so." While I had met him, we didn't have that particular conversation but I recall him speaking at a convention about his children's work including the Nomes and Maurice and him saying he had plans for more Discworld children's books (the Tiffany series, as it turned out).