BedZED (Beddingham Zero Emission Development) is an early example of a low energy housing project. Built to be totally self-sufficient, the ambitious plan included a biomass power plant for heat and electricity, as well as an on-site water treatment plant. It's most distinctive design features are the brightly coloured cowls on the roof vents, which led to it being nicknamed "tellytubby land" The project was built and financed by the non-profit housing association Peabody, who have had a mixed reputation over the years (search the case of Sheila Seleoane for some grim reading) but this is und…