Funding for this research was provided by:
Imperial College Healthcare Partners (Not applicable)
North West London Collaboration of CCGs (Not applicable)
Received: 5 November 2018
Accepted: 15 March 2019
First Online: 15 April 2019
: JS is an employee of the University of Birmingham. When this research was undertaken, she was an employee of the Nuffield Trust for Research and Policy Studies in Health Services (‘The Nuffield Trust’).GW is Visiting Professor at the London School of Economics and an Honorary Professor at the London School of Hygiene and Tropical Medicine.HH is an employee of the Centre for Ageing Better. When this research was undertaken, she was an employee of the Nuffield Trust.MG is an employee of Charité – Universitätsmedizin Berlin. When this research was undertaken, he was an employee of the Nuffield Trust.
: Ethical approval for this study was granted by the research ethics committee of the London School of Hygiene and Tropical Medicine, where the national evaluation of the wider Pioneer programme was located. (LSHTM ethics ref.: 7215). We obtained informed written consent from all interviewees prior to their participation.
: Not applicable.
: JS and GW receive funding from the National Institute of Health Research and the Department of Health and Social Care for research projects and programmes. MG and HH have no competing interests to declare.
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