The Walter's Way Estate in Forest Hill is successful experiment in self-build anarchic social housing. This film tells the story of this project beautifully. With thanks to Joe for the link to this account in The Guardian, which notes:
"The street has welcomed visitors as part of London Open House weekend since 1989, but this year’s event, from 19–20 September, will be extra special, with a day of talks followed by three Segal/self-build streets being opened to the public on the Sunday: Walters Way, Segal Close and Greenstreet Hill."