one of my favourites site is a CMC C L site called Woody Kiln Farm by Milford Haven south Wales for £11 per night you get a full 16 amp electric hook up , water hook up , and aerial and Satellite hook up , its 1 mile from the beach and when you arrive there is a peg on the pitch with a plastic folder with your name and maps and bus times of the area , there is a small shop on site with food items and caravan accessories and has an honesty box as a checkout , only snag for some is you must have own sanitation as there no toilet block , forgot to mention free fast wifi ,
https://www.caravanclub.co.uk/certificated-locations/wales/pembrokeshire/milford-haven/woody-kiln-farm/,