1. Research Department of Clinical, Educational and Health Psychology, University College London, London, UK
2. Anna Freud National Centre for Children and Families, London, UK
3. Faculty of Education, University of Cambridge, Cambridge, UK
4. Department of Health Sciences, University of York, York, UK
5. National Adoption & Fostering Service, South London and Maudsley NHS Foundation Trust, London, UK
6. Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK
7. Research and Development Unit, Tavistock and Portman NHS Foundation Trust, London, UK
8. Department of Social Policy and Intervention, University of Oxford, Oxford, UK