The potentially high cost of enforcing a sufficiently watertight system of certification is probably too high for greentimber to break out of a niche market.
Last week, seven families submitted a temporary application to redevelop a builders' yard on Eaves Green Lane for eight caravans and timber sheds for toilets, showers and cooking facilities.
On the way out to the archipelago from Stockholm, the road winds through the radiant green landscape of a fairy-tale: forests, timber houses, rye fields, fat cows.
