Family members and significant others provide significant proportions of unpaid care for people experiencing a mental illness. Although the carer role is pivotal to contemporary mental health service delivery, the role of carers and the issues they face have received only scant attention in the literature. This paper presents the second part of the findings of an exploratory, qualitative inquiry, which sought greater understanding of carers' experiences of, and attitudes to opportunities for participation in care and treatment at an individual or systemic level, with particular emphasis on the role of psychiatric nurses in encouraging or discouraging participation. This paper explores the theme of systemic barriers to participation. These findings demonstrate the variable experiences of carers in their opportunities to participate and the important role nurses can assume in supporting carers' increased participation in the mental health care for their relative or significant other.