I'm watching/listening to an interview with Pratchett on BBC4 and he has just admitted that when he was young he wrote a parody of Lord of the Rings, mixed up with the world of Jane Austen. Apparently it had the Orcs attacking the vicarage. Alas, it is a long lost work as he misplaced it and wishes he could find it now.
He also mentioned that he always preferred the Orcs and Trolls to the Elves, and how he felt sorry for them as they had 'no redemption'. He says he always felt the Elves 'were up to something'.