In 2011, I did an internship in Seven Dials, a junction in London where seven roads come together. I'd given up on writing after multiple rejections for my first novel, and I was starting to consider a career in publishing instead, but Seven Dials gave me such a strong idea for a setting that I couldn't resist picking up my pen again.

I often look at places and kind of mentally convert them to fantasy versions of themselves.

People question what I thought of Oxford. Students used to talk about the 'Oxford bubble' because the place can make you feel cut off from the rest of the world. I would forget there were places like London that were not centred round libraries and essays.

I'm not going to give it the big 'I am' now that I'm a New York Times bestseller.