All the below are either free or just pay nominal amount for camping.

Bishop's Castle, Shropshire 10-12 June

http://www.bcfolkweekend.co.uk/

Dent, Lake District
http://www.dentfolkfestival.co.uk/

Glasson, Lancashire
http://www.glassonfestival.org.uk/


Newcastleton, Scottish Borders
http://www.newcastleton.com/