Myself and a mate entered a few years ago and got totally thrashed but enjoyed the experience.
We had no knowledge of the river but went along for the fun of it. We caught loads of Whiting and one Codling I seem to remember, the local boys all knew where to go and how to fish it and caught quite literally bucket loads of Cod, the boat that won had 50+ fish
Most fished along the side of the scrap yard place if you know where I mean but as I said it was about 6 or 7 years ago so it's probably changed in that time.
It was a good day out though
Local knowledge is definitely the key