Mezue ahịrịokwu na-esonụ: N'afọ 2009, Miller laghachiri ịsọ mpi n'asọmpi ndị Britain, ọkachasị n'asọmpi 800m. Ka ọ na-erule afọ na-eso ya, ọ gbakwunyere 1500m na ihe ngosi ya wee dekọọ ihe kachasị mma n'afọ ahụ nke 4:27.47. N'afọ 2011, ọ gara Dubai ịsọ mpi na IWAS World Junior Championships, na-emeri ebe mbụ na 1500m na ọla nchara na 800m. N'ọnwa na-eso ya ọ nọ na Germany, ebe o weere ọnọdụ nke abụọ na 800m na German National Paralympic Championships. Nsonaazụ ya na-eduga na 2012 hụrụ ya ka a họpụtara ya maka ndị otu Great Britain maka asọmpi ahụ.
Egwuregwu Paralympic nke oge okpomọkụ na London. N'ebe ahụ, ọ gbara asọmpi na 1500m T37, na-emecha nke asaa na oge nke 4: 21.57.