Re: $deities have a sense of humor
> only a minority of houses have roofs which face in a southerly direction
Citation needed? Roads run east to west in probable equal numbers to ones that run north to south - the last 4 houses I lived in all had south facing roofs. From a statistical perspective I'd expect a moderately even split (ignoring that the UK doesn't lay things out on a grid very much)
Equally, there's arguments for east-west roofs being better for solar as it leads to smoother power generation over the course of the day (perhaps not as much total generation per sq m of panel) - not sure how good those arguments are, tho.