Hi Taff
I would highly recommend Manor Wood Country Caravan Park as it fits your requirements perfectly. Excellent toilets and showers, although not many of them, and TWO fishing lakes. Lots of facilities for a UK site including outdoor swimming pool, tennis courts and games room. It's located in lovely countryside with fantastic views to the Welsh hills.
You can see my and lots of other positive reviews here, I'm number 28, the first one, here.
http://www.ukcampsite.co.uk/sites/reviews.asp?page=5&revid=5486
Angela an Nigel Dutton the resident owners are lovely people and nothing is too much trouble. We first stayed there when they just had a storage area and a CC CL site behind their house. We kept our 'van in their storage andused to go and spend shortbreaks on the adjacent CL whenever possible. Only stopped going after we had our drive altered so that we could keep the 'van at home.
The only downside is that the site is rather expensive but you can use the cheaper CL if you want a cheaper holiday.
Regards
Tim