Although the number of resource provision (RP) classrooms for the education of students with special educational needs and/or disabilities (SEND) in English mainstream schools has increased, very little is known about their functioning and impact. Through collaborative research, based on critical communicative methodology, this study aims to: (1) evaluate with the participants the effective practices and challenges in educating students with SEND in RP and mainstream classrooms, and (2) discuss the position of RP within the inclusion and exclusion debate. Reflective conversations, communicative focus groups and communicative observations were conducted with teachers, teaching assistants, mothers and students in three schools. Two different models were identified in the conceptualisation and practice of RP; either as a service to promote the education and inclusion of students with SEND in mainstream classroom/school, or as a space for specialised provision with opportunities for inclusion. These models reflect two different approaches in the education of these students, the rights- and the needs-based approach respectively. We argue that RP as inclusive service should be prioritised. However, flexibility in its conceptualisation and functioning, either as inclusive service or safe space, can positively contribute towards a realistic approach to inclusion combining human rights and individual diversity perspectives.