Background The shortage of psychiatrists in the UK is a pressing issue, yet the factors influencing the mobility of psychiatric trainees within the country remain poorly understood. Objective This study aimed to investigate the migratory patterns of psychiatry trainees in the UK, examining both their past experiences and future intentions. Methods A cross-sectional survey was conducted as part of the Brain Drain study, directed by the European Federation of Psychiatric Trainees. Results A total of 166 responses were collected. 37% of the surveyed trainees were born overseas. 33% reported short-mobility experiences abroad for 3 to 12 months, and 29% for over 1 year. While academia emerged as the biggest ‘pull’ factor for trainees who had migrated to the UK, amongst all trainees personal factors were most important. 69% of trainees had ‘ever’ considered leaving the UK, and this was associated with previous short-mobility experience. Only 13%, however, were currently planning toward emigration. Conclusions These findings present the UK as a major destination for overseas psychiatry trainees. Previous mobility experiences may influence psychiatry trainees in the UK on future migratory decisions.