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.

Holman's world is a worst case scenario but it's healthy to examine extreme possibilities. If the technology that is used for genetic enrichment in Genus had been distributed equitably, across society, it could have been nirvana, a great world where people don't fear the diseases that we die from. The problems that arrive are more to do with resource hording than technology itself.

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.

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.

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.

I do always know where I'm going in my books. I know the endpoint. I've written only two thousand words of my next novel but I know what the ending will be already.

At the moment we seem to be heading in the opposite direction. However you dress it up, it's pretty obvious who is being affected by the government's cuts.