Again I've been inspired by seeing another house near Bruton made of Insulated Concrete Form. Or in other words "ICF is based on hollow lightweight block components that lock together without intermediate bedding materials, such as mortar, to provide a formwork system into which concrete is poured." I still have issues with using a large amount of concrete even if the end result is a very well insulated airtight house with high thermal mass (nice and cool in the summer and warm in the winter). Anyway it's interesting to research.
Further to that as a possibility if we went down the timber frame idea in order to increase the thermal mass of the building and make the ceilings interesting and really importantly score points with Flora these ceiling tiles look really good. I first saw them at the Eco Homes exhibition.
Most importantly I've managed to actually scan in Harry's first drawings. We've gone back to the east side of the plot dividing the yard / park parking area thankfully out of site from the garden. We're still waiting from Andrew Tuckers comments but we're reasonably positive.
