Just to second everything Kev said, and to illustrate how hard Kingy can be:
I've fished Bluebell a couple of times a year for the past 10 years or so. I started off with Bluebell lake and it took me a good couple of sessions to get to grips with that properly. Don't get me wrong it can be hectic on Bluebell but most people still blank all the time. Those fish have seen everything.
Anyway, Kingy; I have fished the lake twice. On my fist visit I had an upper double mirror and thought hey-ho this is gonna be easy, just fish it like the other waters. How wrong I was. The second session, earlier this year, I spent a blank night on the lock bank and saw loads of fish topping in the far corner. First thing in the morning I moved round there and set up as quietly as possible. The fish stayed in front of me and I thought I was in for a cracker.
To cut a long story short, I spent 2 days and nights with fish all over me trying everything I could (and failing) to get a bite. At one point I had a group of 12 fish visiting a tiny gravel spot in the margins every half hour. I managed to get 6 chops (i.e. 3 boilies, halved) on the spot and sat back to see if they would be taken, no rig on the spot at this point. Twenty mins later there they are, they were straight over to the spot. As soon as they saw those chops they spooked, and I mean spooked properly. Turned, did the off, and didn't come back.
How do you go about catching fish that react to 3 boiles like that?
I've been fishing for carp for 15 years and like to think I know a thing or two about catching them, but those fish in Kingy did me up like a kipper.
One thing I will say is it must be the most exciting blank I've ever had, and I can't wait to get back there at some point. All the same, if it's your first visit to the complex I would start with one of the easier waters and even then don't count on having a red letter day. Unless you're bang on numbers of fish even Bluebell, Mallard etc can be tricky.