The National Institute for Health Research (NIHR) funded Well-being and Health for People with Dementia (WHELD) programme, An Optimized Person Centred Intervention to Improve Quality of Life for People with Dementia Living in Care Homes. This optimized intervention is based on a factorial study and qualitative evaluation, to combine: training on person-centred care, promoting person-centred activities and interactions, and providing care home staff and general practitioners with updated knowledge regarding optimal use of psychotropic medications for persons with dementia in care homes. Using a train-the-trainer model, the intervention was delivered by trained therapists, who trained 2 lead care staff members (WHELD champions) within each care home to implement the intervention over a 9-month period.