Biographical notesShelina Visram is a senior lecturer in public health at Newcastle University (formerly an associate professor in public policy and health at Durham University, where the research detailed within the manuscript was undertaken). She has expertise on health inequalities, asset-based approaches and lay or peer involvement in public health, and is experienced in qualitative and mixed methods research. Shelina has over 15 years' experience of undertaking evaluations of complex, policy or system level interventions, often funded by local government partners as well as larger scale projects funded by the NIHR and Department of Health & Social Care. boundaries. Rachael has published in internationally-renowned journals on leadership, knowledge management and innovation in public services. She has experience of process evaluations, qualitative methods and case study research funded by the ESRC, NIHR and