OK, so possibly the title is an oxymoron.
DC's number 1 criteria for our holiday this year is apparently a swimming pool (though they are actually thinking nearby rather than on site, on site would be good ...).
I've done a brief trawl of ukcampsite but all the sites with pools seem to be larger with lots of nightlife, whereas we tend to prefer the smaller quieter sites where it's pretty quiet after about (say) 10pm and there is not loads of noise (old fogey alert).
We have no particular thoughts at this time about what part of the country we want to go to, just wondered if anyone had stayed on such a site they could recommend?