We just stayed at Coopers for a bank holiday weekend (3 nights). We picked it as it was the only one allowing late arrivals and we had a 4 hour drive from London after a work day Friday. The site is actually comprised of four separate fields. On arrival we payed for the whole stay plus £5 deposit "for good behaviour", which was refunded when we left. We were told to drive through the first field and pitch anywhere we liked in either the second or the third one. Note that all fields are on slopes and finding a level area is a problem.
The most important thing to note is that there is no mobile reception anywhere on site or even in the pub near the site. We were meeting another couple at the site - and at 10:30 pm under the rain, on a large site, without mobiles was rather painful. Apparently, there's no reception on ANY of the UK networks (we tried 3, orange, t-mobile, o2 and voda).
Once we found each other and pitched up, the rest was pretty much what we expected. Open fires are not allowed on the site. BBQ is allowed by only with charcoals and only raised at least a foot of the ground. We were advised to keep the noise of the minimum after 10 pm, but we never had problems with the noise and neighbours didn't complain either.
We didn't get any nagging from the owners, as some other reviews mention. The owner came once on the morning after our arrival to check the ticket. In three days we were there we haven't had any problems.
The major letdown is the facilities. They are very basic and probably haven't been updated in 20 years or so. Toilets are rather old but still sturdy. There are only 4 stalls in the men's toilet and I don't expect many more than that in the women's one. Toilet paper was almost non-existent, so always carry a roll with you. For a 20p coin you get about 5 minutes of hot shower, but in the shower cabins there is no room to hang your clothes or the towel - best is over the door and even there it gets a bit wet. Sinks for washing up are decent size, but the taps are a major letdown. They are of the push-button type. Separate hot and hold taps, each of them only provides water while you are pushing it down. As soon as you release the push-button, the water flow stops. There is no way to properly wash your hands. The sinks for washing pots and pans are the same. There's no special "drinking water" tap, but there's some tap just in the middle of the first field. We boiled that water and it was drinkable after that.
We didn't use the cafe at the entrance or the pubs around, as when on site we cooked and when out, we were too far out.
Overall, this is a nice basic camp site. If the facilities are improved it could easily become a 5-star affair rather than a 3-star.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.