The Lancaster Cohousing group is situated near Halton on the River Lune near Lancaster. They are in the process of building over 40 certified Passivhauses including flats and houses, and a communal building. The construction is mainly concrete blockwork with OSBOriented Strand Board based internal linings.
There are some existing industrial buildings on the site which may be improved and converted. This is likely to be an example of communal self build with extremely high ecological standards. There is a Guardian blog
Architects are ecoarc
The two main books on cohousing are both excellent and well worth reading partly because of the range of examples they give on the continent and the US.
The other book
covers what is something of a relatively recent departure from the central idea of cohousing, i.e. a fairly balanced community.