The ponds in question are walrow ponds, i used to live in highbridge and fished it many times.
There are 3 ponds, the one with the island in it has the biggest fish, the fish fluctuates from around 28 - 30lb depending on whether it's spawning, it was caught in the summer at 30lb.
There are also a handfull of 20's.
The day ticket is £4.50 and you can night fish there.
Hope this helps.