Ok , is it 2 or 3 acres , is it fenced ? ,how secure is the venue ? and their is the odd Carp in their . Not much to go on to be fair.
Looking at it as a Carp fisherie their would have to be a lease for X amount of years , night fishing a must and access 24/7
At the end of the day without viewing the venue it’s all just guesswork and speculation .