Your stipulation on England or Wales rules out all the best - there's some fantastic wild camping beaches in Scotland - unlike England & Wales, it's encouraged, not outlawed.
Ah, Paws, you beat me to it! I was going to recommend Norman's Bay C&CC site. I really enjoyed the holiday I had there a couple of years ago. Lots to see and do, including some lovely walks for the dog.
Yep CyberCynth, great minds think alike!
Its a lovely part of the world, handy for Eastbourne and Battle, and its difficult to get much closer to the sea without getting wet!
old paws found the dog walking excellent too!
All best
paws
We are having real difficulties in finding a site ( ideally with a serviced pitch ) in the lake District with a swimming pool and entertainment that is open next Feb ( school half term ) the vast majority of the sites are open from March/April onwards