It gives a long list but many are in private caravan parks and not available to (or charge) the public. Also I looked up a few at random which I have used and they were not shown.
As Bob says; get WikiCamps.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
Welcome to GN's Netscrounger, The Wikicamps app is probably the best source for locating dump-points, as well as other useful travelling/camping information.
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Possum; AKA:- Ali El-Aziz Mohamed Gundawiathan
Sent from my imperial66 typewriter using carrier pigeon, message sticks and smoke signals.