A critical faculty is a terrible thing. When I was eleven there were no bad films, just films that I didn’t want to see, there was no bad food, just Brussels sprouts and cabbage, there were no bad books—everything I read was great. Then suddenly, I woke up in the morning and all that had changed. How could my sister not hear that David Cassady was not in the same class as Black Sabbath? Why on earth would my English teacher think that The History of Mr Polly was better than Ten Little Indians by Agatha Christie? And from that moment on, enjoyment has been a much more elusive quality."