Increasing access to children’s social care data presents enormous potential for research and policy evaluation, with opportunities increased where data can be anonymously linked to other sources of information, such as health and education data. The purpose of this scoping review was to provide an overview of all UK data linkage studies that have used routinely collected individual-level children’s social care administrative data. Six research databases were searched and twenty-five studies were identified as meeting the inclusion criteria, with the majority (n = 18) based on English data. Complexities and the time-consuming nature of these studies are highlighted, as are issues with missing data and inconsistencies in recording information across local authorities, impacting on the linkage process. Increased access to such data, and improvements to data capture, could improve the utility of these valuable administrative data assets in the social care sector.

IntroductionChildren who are 'looked after' by the State are considered one of the most vulnerable groups in society. Being in State care is associated with poor social, educational and health outcomes. Exploring how to improve the system and better support children in care is key to improving these outcomes. When children and young people come to the attention of children's social services a significant amount of information about their care experience is routinely collected by local authorities. In Wales, routine data are captured in the 'Children Looked After' Census which is submitted annually to the Welsh Government and has recently been shared with the Secure Anonymised Information Linkage (SAIL) Databank. MethodThe aim of this paper is to provide an overview of the main 'Children Looked After' Census dataset and its subsets. These datasets contain rich, situational and individual level data on children looked after, such as information on placement types, education and leaving care. We outline the strengths and limitations of the available information and how to access the data. ResultsThe 'Children Looked After' Census has recently been made available for research purposes and access to it will enable researchers to explore and understand at population level the journey through the care system and outcomes of leaving care. There is also the opportunity, through the SAIL Databank, for data linkage to health, education and family justice datasets, allowing research to holistically explore other factors associated with being in care. ConclusionThese data provide a rich source of information about children and young people who have been in care in Wales. They offer researchers opportunities to better understand the care system and outcomes for this within it. Findings will have important implications for making improvements in children's social care policy and practice.