I think there's an underlying insecurity to Bush with a rather classical genesis - namely his being the eldest son of a famous father. I think this has propelled his need to be distinctive, to do big things.

I don't want to paint myself as some kind of saint - that would be laughable - but I do think I've been able over the years to write humanely about subjects who are controversial and even contemptible. I've profiled pedophiles, stalkers, serial rapists, prison gang members and corrupt politicians.

As a journalist, you sort of grind away, taking rejections as they come, building on whatever advances you've achieved.