The Keep - Span House for sale (estate agent pictures) in the Cator Estate in Blackheath.

I love the green letter box plate (it perfectly compliments a 7o's Porsche 911 in Viper Green). Have been researching Span houses, pioneered by the architect Eric Lyons.

A friend who used to live in one sent me the link to a photographer called Tim Crocker, who has documented them.