I have found the website Camping & Campsites UK http://www.campingandcampsites.co.uk really useful to use. Its based on google maps so you can look anywhere in the UK on the map to see where campsites are and it puts the infomation for a campsite you select next to the map so you don't have to keep going backwards and forwards. Also as a Mac user there is a widget that can be downloaded which makes looking up campsites really easy. I like the look and feel of the website as its not cluttered by ads and banners and its really easy to navigate around. The forum is quite small with only a few regulars but I think over time this will grow into a solid base.