Hi Nick,
Personally I would avoid Swangey main lake. This is just my opinion, others may disagree, but its not really the lake to get a bend in your rod. I have fished the 2nd lake a few times and caught some decent double figure carp. The main lake is always full and has lots of unwritten rules about how far out you can cast etc. This was how it used to be anyway, I havent fished it for a few years so might have changed.
Taswood can't comment as I havent fished it. If you wanted a bend in your rod you could have tried somewhere like catch 22 that's fairly easy. Drop me a PM if I can be of any more help and good luck