I grew up on a suburban street with lace curtains and dull neighbours, so I made up stories to tell my friend, in which they became serial killers and burglars. She told her mother, who then told mine.

If you are going to make companies, corporations, actually responsible for the safety of other people's lives, then if they fail in their duty, the only thing to prevent them failing in their duty is the fear that they would be put behind bars.

The kind of response I hope for when I write my novels for children: to give them a chance to recognize something of their own feelings -- about themselves, their parents, their friends -- and their own situation as a kind of subject race, always at the mercy of the adults who mostly run their lives for them.

I hope in my books I help children to see their strengths, and show them I have some idea of what they may occasionally be going through. Especially at tricky moments when it is easier to go back and evade things rather than go forwards and confront them.

But I don't write about sex for today's teenagers. Or Doc Martens boots either. I'm more interested in exploring how exactly the world is run, which doesn't really change that much from one generation to another.

Adults get more confused by social worker jargon. Unlike children, they are also less likely to see two sides of an argument, and they no longer think they can make the world a better place. That can make them rather boring, I suppose.

People's lives are in the care of the railways when they get on a train. The railways should remember that.