Footnotes

• Competing interests: TS is a Non-Executive Director of an NHS trust, Vice-President of the Royal College of Paediatrics and Child Health and a former advisor to the National Patient Safety Agency. The views expressed in this article are personal views and not necessarily the views of those organisations. The attachment to Shell was organised by the National School of Government. Nottingham University paid for his travel, and meals and accommodation were provided in the Shell Visitor Centre. TS has never had any financial interest in any aspect of the energy industry.