I stayed in this campsite once, 20 years ago.
The tent ended up full of wasps, I got the shit kicked out of me by "The biggest piss-head in Oswestry" and the owner of the site was a right old money-grabbing battleaxe.
Of course, she couldn't have predicted that the internet would come along and allow me to diss her site to the whole damn world, but it did, and so I can. And I have. So there.
In fairness to her and to the wasps (it wasn't their fault) I haven't told you where this campsite actually is. If you choose to look at the coordinates and work it out for yourself, well that's your business. The Wales tag may help you narrow your search somewhat, if that helps.