Thanks for all you comments- very grateful. We have solar panels on a frame in our field next to the house, as we did not like the idea of panels on the roof of this ancient house. And we have plenty of space at the back of the house, where any noise would not be a problem at all. So will be seriously looking into it. We like the idea of being very eco efficient and independent- with a great variety of energy sources so if one fails, we have the back up. We have oil central heating, and the solar panels are for hot water, with the CH kicking in in bad weather- and a massive stone clad wood burner that can keep this giant warm in all weathers.