We visited that house after the roof had been repaired. I just rang Richard Hawkes, told him about our plans and asked if we could have a look around. He is a very nice, helpful chap and was happy to show us the various technologies he used. It was a long time ago but IIRC the house was a test bed for several unusual things such as water cooled PV and paraffin wax phase change panels in the walls. He also used glass chippings in the concrete floor which he had polished, looked great.