I come from a privileged background but I worked a lot of winter seasons in the Alps and I've done lots of mundane summer jobs back in Britain where I mixed with less well off people. Maybe it comes from there but I've always felt that it's our duty to make society fairer.

You are supposed to look at the unimproved and think about the way that we dismiss so-called 'chavs' and certain immigrant classes that are considered unworthy, the "undeserving poor". Those kind of prejudices are getting worse.

What I imagined doesn't require anti-gravity beams or anything too spectacular, just advances in analysing different genes, finding out what they can do and recombining them.

I come from a privileged background but I worked a lot of winter seasons in the Alps and I've done lots of mundane summer jobs back in Britain where I mixed with less well off people. Maybe it comes from there but I've always felt that it's our duty to make society fairer.

I wanted to write a book that imagined where advances in the study of genetics might lead us. Holman was the first character who came to me: I envisaged the misshapen offspring of beautiful, wealthy parents. Then I realised that he bore a striking resemblance to Toulouse-Lautrec. I developed that, made Holman an alcoholic who lives among hookers, an artist tortured by his disability.

I debated whether or not to pin the setting down to a particular date but in the end I decided to leave things vague. It depends how fast technology improves.

New technologies are a good thing but we must consider how they will impact on us so that, when they become achievable, they aren't allowed to run amok.