Siobhan said that when you are writing a book you have to include some descriptions of things. I said that I could take photographs and put them in the book. But she said the idea of a book was to describe things using words so that people could read them and make a picture in their own head.

I was born too late for steam trains and a lazy eye meant I'd never be an astronaut.

Eventually scientists will discover something that explains ghosts, just like they discovered electricity, which explained lightning, and it might be something about people's brains, or something about the earth's magnetic field, or it might be some new force altogether. And then ghosts won't be mysteries. They will be like electricity and rainbows and nonstick frying pans.

I've worked in television long enough to know that when you stop enjoying that type of thing you go home and do something else.

There's something rather wonderful about the fact that Oxford is a very small city that contains most of the cultural and metropolitan facilities you could want, in terms of bookshops, theatre, cinema, conversation. But it's near enough to London to get here in an hour, and it's near enough to huge open spaces without which I would go insane.

Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.

And I know I can do this because I went to London on my own, and because I solved the mystery…and I was brave and I wrote a book and that means I can do anything.