Update
Morning all. Sorry about the lack of updates, I sat on my camera and haven't been able to charge it up yet.
Anyhoo... first the good news!
The new water butt has arrived, and has been plumbed in. It's amazing how quickly they fill up, and amazing how much water the munchers actually use!
I've installed most of the CP's in massive trays, so having a bigger surface area obviously increases the rate of evaporation, hence using more water, but I think they're much happier this year. The first pitchers are opening now, and I think that some have started catching flies.
I'll try to take some pictures tonight, and post them later. TTFN!