UPDATE:
New Campsite!
Cherry Orchard Campsite, Newland, Coleford GL16 8NP
Google + code: Q9R2+GQ Coleford
http://www.cherryorchardcampsite.co.uk/
£10pppn
Can't put it better than Wordsworth:
"Once again
I behold these steep and lofty cliffs,
Which on a wild secluded scene impress
Thoughts of more deep seclusion; and connect
The landscape with the quiet of the sky."