alick
I fished a charity match there last year and had a couple of pleasure sessions in the run up. There was only the main circular lake and the snake then, the others were still being dug out. Main species are carp (all varieties) with some small barbel in the snake. However as a river angler i only fish commercials in the close season (never in matches either) so am a total novice with carp
I drew the circular lake in the match, fished pole at about 8m and had 26lb of carp to 5lb and a few skimmers and bits, taken on a variety of baits, and caught at all depths, problem was keeping the fish in front of me. Top weight on that lake was about 45lb, carp taken on pole and paste fished very shallow, but don't ignore the feeder/bomb. There's a big island too, though its out of pole range.
Snake is 11-12m wide, the match i was in was won the 176lb from here, carp to 9lb on pole fished tight to the far bank. However when i pleasure fished the snake i couldn't get carp any bigger than about 3lb, plus some barbel 12oz - 1lb. I caught well down the middle as well as right over, but in a match this may not be so productive.
If you're local i'd suggest having a drive over to sus it out as i don't know what lake your match will be on. Good luck mate.