My mum used to tell me to never boil my cabbages twice, and I think it's artistically valid. While I do find myself on similar themes in my books, I try not to repeat myself, and that's something which is all too easy to do in series books.
I had a very happy childhood, but I still used my imagination as a leisure resort.
My brother, whom I adored, typed out a children's book illustrated by himself... at the age of 14. My sister, with whom I always shared a double bed, had that effortless superiority of someone six years older and anxious to show it. But we were each as shy as voles. It seemed safer to keep to each other's company.
I'm not one of those people who had a burning passion for 'Peter Pan' all my life. Although I can't remember a time when I didn't know the story, I didn't carry around with me an ambition to one day write the sequel.
The chief thing is to make children feel good about themselves. They want to step into the shoes of a hero who is bigger and stronger, to face tremendous dangers and come home safely for tea.
I read hugely as a child, but I slowed up when the print got smaller. I am a very slow reader. I don't know why. Maybe it is like some people chewing their food for ages and some wolfing it down.
When people write fan-fic sequels to one of your books, it gives you a very strange feeling. It is very flattering but strange, as if the characters have come to life again without you knowing.
You need to be able to climb into a narrative and zip it up under your chin. You need to be able to see through the eyes of the hero, smell what he's smelling, hear what he's hearing.
Writing is writing to me. I'm incapable of saying no to any writing job, so I've done everything - historical fiction, myths, fairy tales, anything that anybody expresses any interest in me writing, I'll write. It's the same reason I used to read as a child: I like going somewhere else and being someone else.
Most of my central characters lack confidence but overcome their timidity or low self-esteem to win through in the end, so I suppose there is a kind of wish-fulfillment at work.
I like working in children's books because it gives rise to such a variety of jobs. One month it may be a picture book, the next a retelling, the next a play, a short story or the start of the next novel.
I still keep thinking someone will penetrate my guilty secret - that I have been masquerading as a writer all these years while all I was really doing was enjoying myself, pursuing my passion.
'Would I mind if someone wrote a sequel to one of my books?' I asked myself, and I decided that I wouldn't, providing that the writer was respectful, had read my book first, and wasn't drunk when doing it.
I never dreamt I could be an author when I grew up. It just didn't occur to me, because I thought you had to be a) academic, so go to university, things like that, and I didn't think I was clever, or b) dead because I just assumed all the authors in the library were dead.