The NHS collects people’s confidential data to provide their care but how else is it used? Should people be able to opt out of uses of their health data for purposes such as medical research, improving public services or commercial uses? Dame Fiona Caldicott is the National Data Guardian for Health and Care in England; Sir Nick Partridge is the former CEO of the Terence Higgins Trust and Dr Tony Calland is a former GP in Wales. Chaired by Professor Jonathan Montgomery, Professor of Health Care Law at University College London.