Implementing relational continuity in general practice-understanding who needs it, when, to what extent, how and why: a realist review protocol.

INTRODUCTION: Relational continuity of care (RCC) refers to the sustained therapeutic relationship between a patient and a clinician, which fosters trust, enhances communication and facilitates the accumulation of knowledge about the patient. RCC is associated with enhanced patient outcomes, reduced hospital admissions, lower mortality rates, decreased healthcare costs and improved patient experience. Despite these benefits, reorganisations within the NHS and workforce challenges have led to an increased reliance on multidisciplinary and part-time working, resulting in fragmented care and a decline in RCC. Our study aims to explore who needs RCC, under what circumstances, to what extent and why, with the goal of informing optimal implementation strategies. METHODS AND ANALYSIS: We will conduct a realist review to develop an evidence-based programme theory explaining the mechanisms underlying RCC, the populations that benefit most, the contextual factors influencing RCC and effective care models. Following Pawson's five iterative stages, we will: (1) Locate existing theories, (2) Search for relevant evidence, (3) Select appropriate articles, (4) Extract and organise data and (5) Synthesise findings to draw conclusions. A stakeholder advisory group, comprising policymakers, healthcare professionals, public contributors and patients, will be engaged throughout the process. We will adhere to Realist And Meta-narrative Evidence Synthesis: Evolving Standards (RAMESES) for realist reviews to ensure methodological rigor. DISSEMINATION AND ETHICS: Our findings will inform practical, evidence-based recommendations for optimising RCC within general practice. Outputs will include peer-reviewed publications, conference presentations, plain English summaries, social media infographics, a short video and end-of-study events. Collaborations with stakeholders and public involvement will ensure both accessibility and impact. Ethical approval is not required for this review.