Mezue ahịrịokwu na-esonụ: Mathieson tinyere ERA E-Type na Leslie Johnson dị ka onye ọkwọ ụgbọala, maka 1949 Richmond Trophy, Jersey Road Race na British Empire Trophy, yana
Nnukwu Asọmpi Briten nke 1950. Ụfọdụ ndị na-ekwu na ihe ndị a bụ ihe ndị ERA dere n'akwụkwọ n'ihi na Johnson zụrụ ụlọ ọrụ ahụ na-emepụta ụgbọala afọ atọ tupu mgbe ahụ. Mathieson zụtara 2 lita Frazer Nash Le Mans nke ọ meriri klas ya na 1950 24 Awa nke Le Mans yana Richard "Dickie" Stoop.