Muir Gray1, Erica Pitini2, Thomas Kelley3, Neil Bacon4. 1. 1 Nuffield Department of Primary Care Health Sciences, University of Oxford, OX2 6GG, UK. 2. 2 Better Value Healthcare, 18-24 Middle Way, Oxford OX2 8JQ, UK. 3. 3 International Consortium for Health Outcome Measurement,1 Eversholt Street, London NW1 2DN, UK. 4. 4 iwantgreatcare, Unit 2 Manor Farm, Barns Witney Road, Finstock, Chipping Norton, Oxfordshire OX7 3DG, UK.