Not fished it myself for a good few years but a mates son does fish it fairly regularly. He does seem to catch a fair amount of fish, nothing massive, low 20's is the biggest he has had this year as far as I am aware with the average being low to mid doubles. He does say there is a handful of bigger fish about but they are very few and far between and although there is supposed to be 1 or 2 30's in there he is not convinced that is the case.
He tells me fishing tight to the island with some free bait, but not too much, is the most productive for him. A good quality fishmeal boilie and a little pellet are his preferred baits, although he has said he has done OK on Urbans nutcracker when he has run out of his fishmeal bait.