Objective: The aim of this study was to analyse the migration of doctors between the UK and France, in an attempt to identify the reasons for these migrations. Design: This was a cross-sectional study conducted using a self-completed questionnaire. Setting: The questionnaire was sent to all British doctors practising in France and to all French doctors practising in the UK. Participants: The doctors were identified, thanks to official data of the National Medical Councils. There were 244 French doctors practising in the UK and 86 British doctors practising in France. Outcome measures: A questionnaire was specifically developed for the study to determine the reasons why doctors moved to the other country and their level of satisfaction with regard to their expatriation.