Nearly forty years ago, Stenhouse argued that the function of the curriculum was to stimulate teachers' everyday reflection about and learning from practice. This suggestion, alongside his support for teachers as researchers, aligns with the Welsh Government's commitment to build an evidence-informed profession as part of ongoing major education system-level reforms, including the implementation of the new Curriculum for Wales from September 2022. University initial teacher education (ITE) partnerships are playing an important role in building collaborative research capacity. This paper describes a case study of one such partnership which aims to promote research-informed, reflective practice among its postgraduate primary student teachers. We use one of Stenhouse's principles of empirical study to frame our discussion of how student teachers' reflective practice is supported through brief conversations with their teacher educators (mentors) during lessons. Using a mixed methods approach, the findings show that student teachers value in-the-moment feedback. The intervention also helps them to question aspects of teaching and learning, although such reflection is at a technical level. Our study is useful for teacher educators who are interested in supporting reflective practice through coaching and mentoring. It also cautions school leaders and policymakers implementing major curriculum reforms not to lose sight of Stenhouse's view that 'it is teachers who, in the end, will change the world of the school by understanding it'. The paper concludes by discussing the research implications in shaping emerging practice and policy in the context of ongoing system-level reform and curriculum implementation in Wales, with potential applicability and portability to other contexts and jurisdictions.