David Cheshire is a Director at AECOM, specialising in sustainability in the built environment. David is the author of Building Revolutions, a RIBA Publications book that explains how to apply the circular economy to the built environment. The hierarchy proposed in Building Revolutions is referenced in the London Plan and he is currently working with the GLA to implement the Circular Economy Statement Guidance. David has recently published a second edition titled a Handbook to Building a Circular economy, with new case studies and insights.