Where did you get the idea for your most recent book?
I always start with What If... I've got four kids, they were all in detention at some timer or other, so I wondered what would happen if a group of 16 year olds left detention and walked out into a world they didn't belong in.
It was a real What If... that I started to find answers for.
Also when I was much younger I swear I cycled my bike into another dimension once. Cross my heart - but for about two minutes I thought I was in a carbon copy of my home street, only everyone had somehow disappeared. That seems to have stayed with me.