For analysis the London medical schools were combined into one. Accordingly, all regions described by us in this paper had medical students and specialty training programmes. In the era of the NHS Regional Health Authorities, it was national policy that there must be at least one medical school and postgraduate specialty training programme per region. To achieve continuity over the period covered by the study, the regions we used were those of the National Health Service (NHS) following the reorganization of 1974 into 14 English Regional Health Authorities (combining the four Thames regions, that included London, as one), four regions in Scotland, Wales and Northern Ireland. Locations were coded initially by UK county and were re-grouped for analysis into UK regions and UK countries. Since the 2008 cohort had not yet progressed far enough, its doctors were excluded from comparisons of training location and for the same reason doctors belonging to the 2002, 20 cohorts were excluded from comparisons of career location. All cohorts were used for the comparison of family home with medical school. The year-of-qualification cohorts we surveyed were those of 1974, 1977, 1983, 1988, 1993, 1996, 1999, 2000, 2002, 20, and they contribute to comparisons depending on the career stage they have reached as follows. We limited the analysis to medical students who had a family home in the UK prior to beginning medical school (referred to as ‘UK-based’). For example, we compared movement between location of home and medical school, medical school and specialty training, specialty training and career post, family home and career post and medical school and career post. In this study we analysed a range of ‘pairwise’ comparisons. We ask doctors about the location of their family home, clinical medical school and jobs after qualification. We send up to five reminders to non-responders. Our questionnaires are mailed one, three and five years after qualification, at 10 years and at longer time intervals thereafter.