If you are a member of C&CC the CS at Copenhagen Farm Bramford is a great site. It is about 3 miles from the park and ride or there are buses into town passing end of lane (about 1/2 mile from site).
------------- 'A sure cure for sea-sickness is to sit under a tree'
I've stayed at Orwell Meadows. It's pretty close to the main park and ride and a nice site. Also great if you wanted to walk the natural trail next door.