Colin was Principal Environmental Health Officer at the London Borough of Lambeth. He then became Head of Environmental Health and Trading Standards at the London Borough of Richmond Upon Thames, where he was Lead Officer for the award-winning local authority audit and Environmental Charter. In 1995 Colin became an independent environmental health consultant, managing multidisciplinary environmental projects including the assessment of noise and air pollution. He is experienced in the preparation and presentation of expert evidence in connection with litigation and at Public Inquiries, including the Heathrow Terminal 5 public enquiry and judicial reviews.