In reply to Guest LDT - I had a tour of the Sidholme Hotel the other day when I took a festival attendee to the airport (to save her a £28 taxi fare!). They seem to offer good value and have rooms free for next year. £62 for B&B and evening meal included and apparently no single room supplements. Meals are quite good too so I'm told. Other hotels were advertising B&B alone from £60 - likely with a supplement for a single person.
The main part of the hotel is rather grand - piano in the music room, vaulted ceilings, very 'Jane Austin' and only a short walk into town. They made themselves very unpopular with the Folk community a few years ago by cancelling a block booking (details on my unreliable website but all obtained from people who were directly involved!) but they happily accept individual folkies. Some people have been going there for over 10 years. I mention it only because I had a conducted tour a few days ago. The annex rooms are a bit naff - better go for the main building if you can afford it.
Maybe I should visit every available campsite and hotel and extend my unreliable photographic website record so as to be even more unhelpful to potential festival attendees?