Not so dopey
It may have been that word 'hemp' which triggered a subconscious interest. But there it was, the Suffolk Housing Society's site. And 'Suffolk', whence, in the early 70s, a lot of the old metropolitan hippie community decamped to run smallholdings, smoke their gardens and lead the righteous life.
Whatever, the housing society has been experimenting with hemp/lime construction with, it needs to be said, much greater technical than architectural success. The technology appears to be a modern variant on wattle and daub: the basic structure is actually a timber frame with finely shredded cannabis sativa mixed with water and hydraulic lime packed between the studs. The mix is known commercially as isochanvre. You can only wish them well. The downside is having the local drug squad doing 24/7 surveillance during construction. And would firemen have to use special breathing apparatus if such a house caught fire?
Further and better particulars here