It was Baha Mousa’s dad I will always remember. On an oppressively scorching day in Basra, Daoud Mousa first spoke of his son’s death, telling me how the boy’s wife had died of cancer just six months earlier, how Baha’s children were now orphans, how - not long after the British Army had arrested Baha Mousa and beaten him to death, for that is what happened - a British officer had come to his home and stared at the floor and offered cash by way of saying sorry.