OECD countries have established statistical collections to ensure quality within Early Childhood Education and Care (ECEC). Focusing on one part of ECEC -- preschool 'childcare services' -- this paper critically reviews statistical collections specifically designed to measure childcare patterns in England alongside UK data collected for other purposes which can be used to examine childcare patterns. The paper evaluates how far these data provide a reliable basis for examining the childcare workforce, how well childcare usage and provision patterns can be analysed and the degree to which the data provide comparable geographical coverage. Results show analysis is restricted by the various ways data-sets count and classify occupations. Differences in geographical coverage make them difficult to compare. More refinement of occupation categories would make existing sources more useful. The themes discussed here are relevant for other countries seeking to understand how best to utilise their statistical collections for examining childcare patterns.