Dee ihe na-aga n'ihu maka paragraf a - Mathieson tinyere ERA E-Type na Leslie Johnson dị ka onye ọkwọ ụgbọ ala, maka 1949 Richmond Trophy, Jersey Road Race na British Empire Trophy, yana 1950 British Grand Prix
Ọ dị mma. 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.