Yes, I like Pratchett but not sure I would put him in my top five. Orwell is a writer that I have returned to many times in my life and find his themes and styles as relevant as ever. A master story-teller with a message that is accessible as it is chilling.
I also love Chandler although if it came to crime fiction, I would choose Elmore Leonard over Chandler for the dialogue. Don’t know JG. On holiday next week, so might grab a Jane Goodall to find out what she is all about.