I drove to Oxford with my van full of petrol and tin cans, as I didn't know there were service stations on the motorway. I pulled up on the hard shoulder and got my cans out. Then I filled up and set off again. That's how naive I was - so much not a cosmopolitan girl.

To create a past that seemed authentic but would be a fiction, you need an invented language.

I write about sex because often it feels like the most important thing in the world.

The truth is that you can divide your heart in all sorts of interesting ways - a little here, a little there, most banked at home, some of it coined out for a flutter. But love cleaves through the mind's mathematics. Love's lengthways splits the heart in two - the heart where you are, the heart where you want to be. How will you heal your heart when love has split it in two?

The trouble is that when most people are apathetic ordinary people ... have to go too far, have to ruin their lives and be made an object of scorn just to get the point across. Did they really think I'd rather be camping by a polluted river than sitting in my own flat with my things about me?

Great control and great discipline are necessary when you reach your own editing stage of the book, but in the early stages you have to be prepared to let anything happen and to get it wrong or go off track. The development of a character is not smooth or simple - it is as tricky as meeting someone new whom you would like to know better.

I fell into the books, and left myself there for safekeeping.