What is essential to writing good crime fiction? Do you stick to some sort of formula or do you break all the rules? Do you read a lot of crime fiction or thrillers as well?

I read everything I can get my hands on. I love thrillers and psychological fiction but it is rather difficult to read them for pleasure now that it’s my day job. It’s hard not to read with an air of comparing the market. I don’t really take any notice of rules, either in the writing process or in life. Actually, I do have one – if the novelist has mentioned the make and model of a car by the end of the first paragraph, the book isn’t for me. And for God’s sake, don’t start off with a dream. For me, it’s just a case of meeting interesting people and twisting preconceptions on their head. Listen to the radio a lot. People who phone DJs are particularly inspiring – they always seem like the sort of person who could be a killer or the killed. Listen to your inner voice. When some dullard is telling you about their tedious problems, think of ways to kill them, and why. It’s less risky than actually doing it. And you think I’m joking.