Very nice, but where is your solar thermal going to go? I guess there is room on the lower roof if that's not too shaded.
Hehe - we have a similar size roof to the lower one on the back of the garage (out of shot) but to be honest I don't think it's viable as we rarely use hot water for anything other than showers (there's only 2 of us most the time) and not really sure how it would help with the heating unless our entire system was changed. We have one of those huge boilermate things in the airing cupboard and I have no idea how that could be incorporated.