Turning brewery gunk and forest junk into something good

Hops from a Wellington brewery, cotton offcuts from a fashion label and forestry slash has turned Matt Welton into a bit of a Heath Robinson. His first job was collecting scrap metal in London's East End and after careers as a prison officer and cartographer, he has come full circle, this time turning the organic waste he collects into biochar for farmers and growers on his Akatarawa property.