you have to buy a lemington aa book, the owner of the lakes carries them so you can buy 1 off him on the bank (i know he used to carry them anyway), you then pay £3.50 (i think) each time you fish.
there are 2 lakes, 1st 1 you'll come to is the main carp lake, it holds a good number of carp with catches of 10 -15+ fish quite easy on a good day. the record for that lake is just over 30lb.
then at the back of that lake you have a smaller horseshoe lake, which is more favoured for the pole fisherman, but it still holds fish up to 25+ and is a great little stalking lake.