There are conflicting theories about the best ways to support behaviour in schools. This paper captures the perspectives of UK primary school staff regarding the advantages and disadvantages of different behaviour support approaches, in addition to exploring the facilitators and barriers to adopting relational-based approaches. Virtual semi-structured interviews were conducted with 15 school staff across three mainstream primary schools. A reflexive thematic analysis identified nine themes. Participants commented on the approaches' flexibility, familiarity, positive long-term behaviour change and emotional wellbeing and relationships. Key facilitators to adopting relational-based approaches included: whole-school training and understanding; quality and type of training; and working together and feeling supported. Key barriers included: changing perspectives; ease of implementation and familiarity; scarcity of resources; and persevering in the face of difficulties. Themes are discussed in light of psychological research and implications for educational practitioners and future research are considered.