I think the secret is out! It was listed in the Observer or some other paper as being one of their top 50 campsites. As a result, they've had a bumper year which makes it' trickier to book. I reckon they might relax the rules for a big group?? I went off season after the school hols, no advance booking possible, just turn up on day.
I didn't find the Square and Compass on my travels. Shame, looks like just my kind of pub!