Public Health England (PHE) exists to protect and improve the nation's health and wellbeing, and reduce health inequalities. It does this through advocacy, partnerships, world-class science, knowledge and intelligence, and the delivery of specialist public health services through the work of some 5,000 scientists, researcher and public health professionals. Several key staff at PHE also have roles at UCL and many of the members of UCL-TB also carry out work at PHE, with a continual process of knowledge exchange taking place. A key example of this was the adoption of the collaborative process that led to the implementation of the Collaborative TB Strategy for England 2015-2020, written by UCL-TB's Ibrahim Abubakar in collaboration with Sarah Anderson, Hiran Hirani, Ishani Kar-Purkayastha, Lucy Thomas, Leonora Weil and Dominik Zenner.