Land for what? is a coalition of organisations concerned with the need to transform land ownership relations.  Just Space is one of the organisations and the others are listed on the web site here: http://www.landforwhat.org.uk
Later: this is now Land Justice Campaign

A major conference with hundreds of participants from the whole UK was held in London on 12 and 13 November 2016. Details are on the same website, where notes, videos and other materials will  be added. A storify is here https://twitter.com/landforwhat/status/799177514312757249

Photo of the opening: Tim Dickens, thanks

Just Space members and groups contributed to many of the sessions. Pending a compilation of material at Land for What? a few of the Just Space contributions on Using the Planning System  are here as downloads: Slides, and advice on responding to a planning application (LTF).