The iWHELD programme is an on-line programme based on WHELD (Improving Wellbeing and Health for People Living with Dementia), an evidence-based person-centred care programme aimed at improving the well-being of care home residents through staff development (Ballard 2018, Fossey 2019). Clinical trials demonstrated that WHELD improved quality of life and reduced agitation and aggression in people living with dementia. The online resource combining digital resources, interactive tools, and social sharing for care staff working in care homes and live online coaching for care home staff during the COVID pandemic demonstrated an improvement in quality of life and a reduced use of antipsychotic medication (McDermid 2023). This study reports on an implementation project using the Consolidated Framework for Implementation Research (Damschroder et al. 2009) aimed at understanding which factors are important in homes adopting this programme and factors that influence how person centred care home staff development can be rolled out more widely across the UK. Interviews were analysed using a framework analysis approach (Ritchie 2014) to identify key themes emerging from 27 interviews with care home managers and staff who worked in participating homes across six regions of the UK, in order to understand iWheld specific factors. Aditionally interviews were conducted with 16 people who had some current role associated with care home education or commissioning in any of four of the six regions in which the iWheld implementation took place, in order to understand the broader context of psychosocial support and staff development that could impact wider roll-out. The emerging themes will be discussed highlighting the facilitators and barriers to adoption of iwheld and psychosocial training in care homes more generally, the value of evidence  base and of staff development, influence of local networks and the policy and commissioning framework.