Carl
I know it is a bit late now , but PVA Bags of Trout Pellets with a Boilie over the top will basically GUARENTEE you a Bream, with the odd Carp thrown in for good measure. Mainline baits seem to be the most popular down there, with a 50/50 split of Activ-8 and Assassin-8 being used. I have had fish out of there on Essential Shellfish B5 (over there pellets), Activ-8, Nash Whiskey's, Richworth Tutti-Frutti's. The best bit of advice is to pop into the Heron Point tackle shop on site and speak to Buzz behind the counter. He will put you onto the fish if he has been told where they are coming out from. Little tip, don't cast close to the islands. Drop your baits about 4 to 5 feet off them. The carp don't feel safe feeding close to the islands for some reason (probably the amount of pressure that they see).