I think this is pretty close to Saundersfoot and highly recommended but you need to book well in advance
http://www.ukcampsite.co.uk/sites/details.asp?revid=3142
Morawelon down at the Parrog in Newport (Tredreath) North Pembrokeshire.
http://www.ukcampsite.co.uk/sites/details.asp?revid=3219
You don't say whether you mean 'tents only' but if you just mean a site that accepts tents and has EHU available for them, try this one:-
Trevayne Farm
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