Conceptualising and constructing 'diversity' through experiences of public and patient involvement in health research.

To increase diversity within PPI, and to ensure that people of different backgrounds are supported and motivated to continue in PPI, changes are needed in the wider health research infrastructure in the UK. More resources are required to support relationships of trust over time between contributors and professionals, and to ensure the unique circumstances of each contributor are accommodated within and across PPI roles. Finally, critical reflection on the pressure in PPI to seek 'more diverse' contributors is needed, to understand the impacts of this on those already involved.