Gilbert, R. et al. 2026. What is needed to make administrative data ‘research ready’ for causal inference? A case study of the Education and Child Health Insights from Linked Data (ECHILD) database of 15 million children in England. International Journal of Population Data Science. 11, 5 (July 2026). DOI:https://doi.org/10.23889/ijpds.v11i5.3684.