I know it is the case on most of the waters i fish i dont like fishing overstocked lakes a couple of the pis i fish are over a hundred acres and have roughly 30-50 carp in them.
Wraysbury 1 and 2 and kingsmead islands (although i havent fished kingsmead islands for a while and i believe a few stockies have got through from an adjoining lake and when they are caught they are returned to the other lake)
Think you are getting mixed up there is K1 (more like 30 acres and does contain 400 carp) and K2(kingsmead islands which is 50 acres but does not contain 400 carp)