Abstract School-university transition in mathematics is of global concern, with multiple cognitive, social and affective disjunctures evidenced. Access to, successful participation in and retention on, competitive mathematically intensive degree courses remain particular challenges in England, especially for disadvantaged young people with high mathematical aptitude. One response has been to establish mathematics specialist schools aimed at such students aged 16–18. Early cohorts have achieved encouraging progression to and through such university courses, but more qualitative and longitudinal outcomes have been less well evidenced. The reported study harnessed a student lens and documentary scrutiny to analyse the contribution to building for successful transition of the particular approaches used. Data suggest that the model adopted has initially supported transition to target degree courses well. I relate the findings to known transition challenges in the global issue of successful passage into and through university mathematics education. I argue many of those are in principle transferable to other post-16 contexts. The study therefore offers evidence suggesting broadly applicable specific strategies that can begin to address widely problematic disjunctures in transition.