Hi!
Not entirely sure where £80/pppn comes from. Standard double as you mentioned is £250 but that includes your confee. So take about £50 away from that, something like that, so that's £200 for the room. It's also for four nights, so that's actually £50 per person per night. That's in a four star hotel, with breakfast, which I personally think is quite reasonable
Other accommodation in the area is a a little hard to come by. But last year there were two hotels. One was a country hotel, can't remember the name annoyingly. The other was a Premier Inn in Hinckley. Just remember to factor in any travel cost between that hotel and the CF venue
EDIT: Oh, and including the confee... that's £250/4 which is £62.50