A large proportion of long-term care for people with disabilities and/or long-term health conditions is provided by unpaid carers, including young people, with potential impacts on their education, employment and health. Supporting carers is a focus of long-term care practice and policy in many countries. A key part of this support in England is through provision of services to the person with care needs (often called 'replacement' care). We aimed to explore the role of replacement care services in supporting young adult carers' health, education, and employment. We used a mixed-methods approach: self-completed questionnaires and in-depth follow-on interviews. We found ways in which services supported young adult carers but, contrary to previous research, receipt of services by the person with care needs was not associated with better reported carer outcomes in our survey. One key reason for this finding was that not enough services were received to meet care needs and alleviate unpaid caring to a level or type compatible with better outcomes. The wider economic and political context of our study, during fiscal austerity and cuts to social care budgets, and the particular circumstances of young adult carers may offer further explanations.