In search (and memories) of the UK free festivals

I've been trying to find free or cheap festivals for this summer and early autumn in and around the UK. E-Festivals used to work well for this but the search isn't being very helpful. Can you recommend anything for less than say £75 for 3 days camping?

Here's what I've found so far. (I know a couple break my £75 limit)
- Willow Festival, Peterborough, 12-14 July, Free, http://www.efestivals.co.uk/festivals/willow/2013
- Kelvedon, 13 July, Free, http://www.efestivals.co.uk/festivals/kelvedon/2013
- Folk by the Oak, Hatfield, July 21, £30 http://www.efestivals.co.uk/festivals/folkbyoak/2013
- T-Fest, Gray Essex,  27-28 July, Free,  http://www.efestivals.co.uk/festivals/tfest/2013
- Brightlingsea, 2-4 Aug, Free http://www.efestivals.co.uk/festivals/brightlingsea/2013
- Standon Calling, 2-4 Aug, ~£75 if you buy the ticket over the counter locally, I've done this a few times now and don't really need to do it again. http://www.efestivals.co.uk/festivals/standoncalling/2013
- Beacons Festival 2013, 16-17 Aug, no longer cheap but a good selection of UK Bass in beautiful country, http://www.residentadvisor.net/event.aspx?447280
- Priddy Sheep Fair, 21 Aug, a fiver for parking, http://priddyparish.org/Sheep-Fair-Committee.php
- Wilkestock nr Stevenage, 30 Aug - 1 Sept, £35 http://www.wilkestock.com/tickets.html
- WoodyFest, Hatfield Forest, Takeley, 6-8 Sept, Free, http://www.lemonrock.com/woodfest2013
- Alchemy - Lincolnshire, 20-22 Sept, £70, http://www.alchemyfestival.co.uk/