This article studies the effect of free pre-school education on child outcomes in primary school. We exploit the staggered implementation of free part-time pre-school for three year olds across Local Education Authorities in England in the early 2000s. The policy led to small improvements in attainment at age 5, with no apparent benefits by age 11. We argue that this is because the expansion of free places largely crowded out privately paid care, with small changes in total participation, and was achieved through an increase in private provision, where quality is lower on average than in the public sector.Over the last several decades, many governments around the world have sponsored the expansion of early education and childcare. There is a dual rationale behind these policies: to support maternal employment and to promote child development, particularly that of disadvantaged children. This article focuses on the UK, specifically England, 1 a relatively late adopter of universal early education compared to other European nations. The social and economic context prevailing in the UK in the early 2000s makes the British expansion stand out. First, maternal employment was high and supported by an established childcare market of private and public providers; second, the expansion relied entirely on the private sector to provide additional free places which were funded and regulated by the state.In this article, we evaluate the effect of the dramatic increase in free provision of early education and childcare for three year olds in England on early school outcomes.2 This policy was part of a general shift towards intervention in the early years through both universal and targeted programmes. From 2000, fully subsidised part-time nursery places (hereafter 'free places') were rolled out across England for all three year olds. Despite considerable state funds invested (£2 billion per year, National Audit Office, 2012), this is the first rigorous study attempting to evaluate the effects of this policy. There are studies that offer an evaluation of similar policies in other countries.