The UK has extremely high levels of socio-economic inequality, which are predicted to rise over the next five years. Traditionally, equality law was seen as inappropriate to address socio-economic inequality but in the last decade, a growing number of equality duties have been introduced to address this persistent form of inequality. There is, however, little research on the principles that underpin these duties. This article seeks to address this gap through the use of data from interviews

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... from interviews conducted with primary school personnel implementing the pupil premium. The article explores understandings of socio-economic inequality by individuals in schools; policy conflicts; the wider context of action to address socio-economic inequality; different decisionmaking processes; and accountability mechanisms. On the basis of the findings of this study, broad principles are outlined to inform the design, implementation and enforcement of socio-economic equality duties in the future.