The children’s formula is based on extensive research by experienced independent researchers and used the 2003 Children in Need survey, which contains data on children’s social service clients in almost every social service authority in England. It is calculated using up to date indicators of need and is based on research from within 141 local authorities. The new formula therefore better reflects the current patterns of relative need and the cost drivers for children’s social services than the old formula it replaces.
London councils have argued that the formula is systematically biased against councils with the highest needs. However, the consideration of so-called ‘unmet need’ was part of the terms of reference of the research project, and was examined as thoroughly as possible by the researchers. They did not consider this issue impacted sufficiently seriously on the robustness of the formula to cast doubt on its overall reliability.