When the idea comes, I often can't remember where it came from. I remember very little about writing the first series of Hitchhiker's. It's almost as if someone else wrote it.

Really, the moment you have any idea, the second thought that enters your mind after the original idea is, "What is this? Is it a book, is it a movie, is it a this, is it a that, is it a short story, is it a breakfast cereal?" Really, from that moment, your decision about what kind of thing it is then determines how it develops.

The story goes that I first had the idea for The Hitchiker's Guide to the Galaxy while lying drunk in a field in Innsbruck.

I don't really have any advice, other than to say it's the most appallingly difficult thing I've ever tried to do and I wish I had a better idea of how to do it. In my experience what you end up with is the by-product of your failure to achieve what you set out to do. It may turn out OK, but it wasn't what you meant and you've no idea how you got there.

I don't like the idea of missionaries. In fact, the whole business fills me with fear and alarm. I don't believe in God, or at least not in the one we've invented for ourselves in England to fulfill our peculiarly English needs, and certainly not in the ones they've invented in America who supply their servants with toupees, television stations and, most importantly, toll-free telephone numbers. I wish that people who did believe in such things would keep them to themselves and not export them to the developing world.