The Photograph is concerned with the power that the past has to interfere with the present: the time bomb in the cupboard.

Giving presents is one of the most possessive things we do, did you realize that? It's the way we keep a hold on other people. Plant ourselves in their lives.

If we had not met, that day, I think I would have imagined you somehow.

I have had to empty two family homes during the last few years - first, the house that had been my grandmothers since 1923, and then my own country home, which we had lived in for over twenty years.

The place didn't look the same but it felt the same; sensations clutched and transformed me. I stood outside some concrete and plate-glass tower-block, picked a handful of eucalyptus leaves from a branch, crushed them in my hand, smelt, and tears came to my eyes. Sixty-seven-year-old Claudia, on a pavement awash with packaged American matrons, crying not in grief but in wonder that nothing is ever lost, that everything can be retrieved, that a lifetime is not linear but instant. That, inside the head, everything happens at once.

I have long been interested in landscape history, and when younger and more robust I used to do much tramping of the English landscape in search of ancient field systems, drove roads, indications of prehistoric settlement. Towns and cities, too, which always retain the ghost of their earlier incarnations beneath today's concrete and glass.

Every novel generates its own climate, when you get going.