Objective: Investigated clinical effectiveness and cost-effectiveness of a person-centred intervention for informal carers/caregivers of stroke survivors. Design: Pragmatic cluster randomised controlled trial (cRCT) with economic and process evaluation. Setting: Clusters were services, from a UK voluntary sector specialist provider, delivering support primarily in the homes of stroke survivors and informal carers. Participants: Adult carers in participating clusters were referred to the study by cluster staff following initial support contact.