Hey hey, I just read the post and photos of Simon. Shawn and David were commenting that the water tray system that Simon is using is a great idea, specially to prevent mosquitos from laying in the water tray. Hope Simon doesn't mind, I am posting the photo of his system here:
Yes I agree this method is the best one so far to prevent mossies from laying eggs in the water tray.
TTFN
Arvin