The
website seems to talk about, and picture, tents rather than university halls. However, there is no reason why camping = food poisoning as long as there are decent hygiene procedures in place.
LEL, of course, is a similar distance, does use schools and other sites with proper kitchen facilities, and costs about 1/7th of the price (although now fully booked up). I saw somewhere that the orgs estimated that if it wasn't an amateur, volunteer-run event, they might have to charge something like £500-700 to cover costs (but you, Rob, will know more about that than most of us!)