Relationships and Sex Education (RSE) for those with special educational needs and/or disabilities (SEND) is a complex and historically overlooked area, affected by socio-cultural factors, attitudes and beliefs. Research calls for professionals to work collaboratively, in a participatory, person-centred way, with scarce guidance to inform ways of working. This study explored and evaluated how an RSE support group can be developed, supported by an educational psychologist (EP) using Planning Alternative Tomorrows with Hope (PATH) to include the views of parents, school staff and pupils. An exploratory ethnographic case study design was used through participatory action research (PAR). The EP's knowledge, skills and relationship with the school was pivotal in planning, facilitating and supporting the group and providing a safe space for staff to implement RSE and contemplate key issues. Findings suggest that PATH provided a structured, participatory person-centred framework to plan for and support the group process.