Interesting thought is what development would be genuinely acceptable (from an academic point of view, rather than 'we must build here'). My thoughts are that eco things up and that is a big sweetner - and boy do they seem to have ecoed this one up. But only quarter of a mile away you have the Walters way self builds, which were much earlier attempts at low carbon developments. Of course they were for owner occupiers not for a developer to make shed loads.