Hi Wuzy,
The only one I am familiar with is Llyn Carfan, small lake about 1ish-2acres an old trout lake I believe.
I fished it last year twice, almost guaranteed to catch. Good place to go if you want to get a bend in the rod or take someone new to carp fishing.
The owner told us it had fish up to 26lb, but it had not been out for two years?????
I found it full of starving 4pounders; biggest I seen out was low doubles.
There is another lake behind the house but I have never fished it.