Terry Pratchett may be one of the UK’s biggest selling authors, with over 35 Discworld novels to his name, but what’s the book that he wishes he had written?

The Evolution Man by Roy Lewis

“It has several names – it’s also called What we did to Father. It’s the first in a sci-fi series, based on ape-men. It’s about technology – they bring fire back from a volcano – and the leader comes up with the idea of not marrying your sister. It is the best science fiction book ever written.”