I stumbled on this book quite by chance via a series of obscure links. Why isn't it being advertised or promoted anywhere??????
Its great - loads of handy info and detail, not just on festie listings, but also on stuff like the history of the UK festie scene, what's best to cook, what to avoid etc etc - all in a tongue-in-cheek style and not all pompous and serious like the Rough Guide or Lonely Planet books.
The author clearly knows her stuff and obviously spent a lot of time going round dozens of festivals to produce this. The end result is well worth it - everyone who has seen my copy has thumbed through it for ages and tried to borrow it, lol.