This week's episode of the (excellent) The Rest is History podcast is about the Harry Potter books, but contains a great deal of discussion on Rugby School, Thomas Arnold and the history of the English Public School (in the context of being inspirations for Hogwarts). It sounds like next week's episode will be even more focused on the history of Rugby School, although it's not yet been released. It should be available anywhere you normally find your podcasts, and is well worth a listen!