a substantial improvement in WEMWBS scores (mean=9 points, BCa 95% CI [7.23, 10.79], P=0.001) post-intervention. The improvement in scores was highest for those with initially lower levels of well-being. There is therefore evidence that chaplaincy interventions correlate with an improvement of holistic well-being as measured by a WEMWBS score. A prospective study on a larger scale would provide more detailed information on the interaction of possible variables. Further study is also required to evaluate the implications of this result for patient outcomes and GP resources. The efficacy of Primary Care Chaplaincy is under-researched and difficult to measure. This paper represents the first attempt to quantify a measurable improvement in the well-being of patients who are referred to the service.