Sophie is an unusual mix of campaigner, practising designer and Chartered Waste Manager. She’s been working in the fields of sustainable design, behaviour change and material process for nearly 20 years. I invited Sophie on to the show to talk about waste and circular design. In our conversation we get into:

• The engineering of linear and circular products, material selection, recycling houses and oil rigs.
• The creative strategies for circular designers, and in particular the idea that waste is a design flaw.
• And the practical philosophy of someone who has spent so long think about waste.