“At a dinner party in north London, I listened to friends bragging about buying Porsches with their bonuses and sending out from their offices for pizzas and clean shirts because they were clinching a deal and could not leave their desks. I wanted to tell them of a place where every family had lost a son or a husband or had a leg blown off, almost every child seen someone die in a rocket attack and where a small boy had told me his dream was to have a brightly coloured ball. But, when I began to talk about Afghanistan, I watched eyes glaze and felt as if I was trying to have a conversation about a movie no one else had seen.”