I sat in the car waiting for a personal assistant to leave before it would be convenient to be admitted to meet David. A mutual acquaintance had asked me to get in touch with him, explaining ‘he broke his neck in a diving accident. He’s depressed. He hates being paralysed and wants to die. Do you think you could help him or help his mum? Just find out if there’s anything you could do? He talks about suicide all the time. No one knows what’s wrong with him.’