Abstract: Teacher retention is a major challenge, and in subjects, such as physics, where there is already a shortage of teachers, the problem is exacerbated by a high rate of attrition. This research examines the experiences of former physics teachers, asking why they left teaching for reasons other than retirement. Eleven former physics teachers from state-funded schools in England engaged with this study, providing quantitative data regarding their careers and reasons for leaving teaching. Of this group, nine participated in interviews to explore their personal experiences and motivations for leaving teaching. The findings revealed that the participants felt that issues originating in school senior leadership was the most significant factor in their decision to leave teaching, with accountability, autonomy, workload, well-being, and salary all being major contributors.