Students have identified practice placements (or practice learning) as the single most important factor of social work education, but it is usually where issues of professional suitability become apparent. Whilst most students successfully complete their placements, a number experience difficulty and a minority ultimately fail. Protecting the profession from students not deemed suitable for professional practice requires a rigorous gatekeeping function and fair standards. On receipt of written consent, we interviewed 11 social work students who failed placement, and accessed progress reports written by Practice Teachers/Practice Educators. Participants included nine females, mean age 33 years, seven failed their final placement, and eight had registered with university disability services. Professionally transcribed interviews were analysed using an adapted version of Braun and Clarke’s method. Identified themes included the impact of personal issues; importance of working relationships; use and misuse of power; assessment and decision-making processes; and developing insight and useful feedback. Students valued the opportunity to reflect on their experience, and provided clear recommendations for improving how Practice Teachers, on-site supervisors, Tutors and peers can provide a supportive learning experience for students who require additional support during placement, and how to communicate concerns regarding competence more effectively.