This article examines the Health and Social Care Act 2012 and associated reforms to the National Health Service in England. It focuses on the Act's policy of making the NHS market more ‘real’, by both encouraging and compelling NHS bodies to act as ‘market players’. The article considers whether the reforms are compatible with the constitutional requirements of accountability for the provision of a public service such as the NHS. It argues that the reforms threaten accountability for three reasons: they make the Secretary of State for Health's relationship with the NHS more complex, they create opaque networks of non-statutory bodies which may influence NHS decision-making, and (especially in relation to competition) they ‘juridify’ policy choices as matters of law. Taken together, these arguments suggest that there is force in the claim that the reforms will contribute to ‘creeping’ – and thus unaccountable – privatisation of the NHS.