The South Bank Centre at the weekend was engulfed in a festival of homespun politics and DIY culture. Grow Your Own Ideas being inspired by the work of artist Bob and Roberta Smith.

The roof of the Queen Elizabeth Hall sprouted this magnificent wild flower garden.

During the Second World War bombsites became impromptu parks and gardens – the site around St. Paul’s was particularly lush with tall stems of flowers and blossoming Buddliea.

Large areas of post-industrial London could look like this again – such a shame to sell the Royal Docks to the Chinese government when it could be reclaimed by nature.

I’d filmed Bob and Roberta Smith making then installing his Mobile Brownfield Site outside the Royal Festival Hall for Pestival in 2010. His old Volvo and its trailer festooned with weeds, nettles and moss.

Later in the afternoon on Saturday my film about Bob, Make Your Own Damn Art, was screened in the Queen Elizabeth Hall.

Then the Ken Ardley Playboys punk-rocked out against a backdrop of old archive film demonstrating home crafts.