PurposeThe purpose of this research is to identify novel ways of tackling health inequalities of underserved populations. It explores the opportunities presented by the changes in health and social care legislation to employ historically underused services, such as police custody healthcare providers, in addressing health inequalities.Design/methodology/approachThis research analyses the policy approaches to tackling health inequalities in the UK in the past 40 years with an emphasis on those experienced by the people detained in English police custodies. It analyses the current model of healthcare in police custody and proposes a novel integrated model of care and joint commissioning opportunities in funding it.FindingsPolicies to tackle health inequalities have largely failed, as they became entrenched. But recent changes in the health and social care legislation in England offer opportunities to address them by employing historically underused healthcare services, such as those operating in police custodies.Research limitations/implicationsThe research does not touch upon ethical considerations related to the patient privacy aspect of integrated care. Interventions by and interactions with police custody healthcare providers would be visible to all professionals with access to the patient’s health record. As with all novel interventions or innovative models of care, the effectiveness of such clinical interventions remains to be established by further research. It opens a new line of research on quality improvement through integration of care and explores understudied aspects of joint commissioning of integrated care.Practical implicationsIt offers health commissioners and public health leaders the opportunity to employ police custody healthcare services in reaching their population health management objectives and meeting their health inequalities objectives at local level. It also gives police and crime commissioners the opportunity to address the health drivers of criminal behaviour that overlap with health inequalities. It offers funding opportunities presented by jointly commissioning services at lower costs to both police and health commissioners alike. It improves the health outcomes of historically underserved populations by facilitating access to health and social care services and facilities.Social implicationsReducing health inequalities and disparities in health outcomes can decrease the costs of the healthcare services over the long term and might contribute to reducing criminality by addressing inequities and some health drivers of criminal behaviour.Originality/valueThe paper explores understudied opportunities offered by the recent changes in health and social care legislation in England and includes underused resources to tackle health inequalities.