Teachers' engagement in critical intellectual and research work in England has been challenged in recent years under hegemonic policies and practices in teacher education. Since 2019, centralisation, standardisation and accountability in teacher education have intensified, along with explicit criticism of university involvement. Some describe teaching in England as a 'semi-profession' where teachers are positioned as technicians and their engagement in wider ethical, moral and intellectual endeavours are discouraged. Within this challenging policy and practice context, this paper argues that there is a need to reconsider the space of professional "learning" over professional "development" for teachers, and that Master's level qualifications can be site for potentially transformative learning experiences for teachers. An empirical research project is reported, where teachers' lived experiences of engaging in critical intellectual and research work through part-time MA Education were systematically mapped and interrogated. Data was collected through semi-structured interviews and video diaries. Analysis of significant episodes of each teacher's narrative unlocked an understanding of their shared journeys as 'becoming', 'being' and 'belonging' as a teacher and a researcher. Conclusions and recommendations are presented which challenge current reductive policies and practices along with a call to prioritise teachers' critical and intellectual knowledge and research work.