Popped out on my bike for half an hour - two things struck me. Firstly, how nice and sunny it was. Secondly, on all of the thousands of new houses around here that heve been put up recently, there was not one with any kind of solar collector on - whether for hot water or photovoltaics. Seeing as the cost for the hot water collectors is only a grand or so it's amazing they don't bother putting them on from new - I'd have thought it was a good selling point that the heating bills will be about half what they would otherwise be.
And yes, I know ultimately the builders don't make that saving so they don't give a damn, but really, it's irresponsible.