In 2009, Miller was back competing at British meets, mainly in the 800m event. By the next year he had added the 1500m to his repertoire and recorded a personal best that year of 4:27.47. In 2011 he travelled to Dubai to compete in the IWAS World Junior Championships, winning first place in the 1500m and a bronze in the 800m. The next month he was in Germany, where he took second place in the 800m at the German National Paralympic Championships. His results leading up to 2012 saw him selected for the Great Britain team for the Summer Paralympics in London. There he competed in the 1500m T37, finishing seventh with a time of 4:21.57.