Have you tried using the Camp Site Search? You fix your ideal location on the map & choose what facilities you need, then check a few recent reviews of the sites that come up. It may be that one just a bit farther away is more highly rated. I can only remember lots of static sites nearby, but it's been a while since we were there.
Hi, we can recommend Springhill Farm, Seahouses. Lovely site with great views and within reasonable walking distance to Bamburgh Castle and Seahouses. Lots of dog walking around too!