<prompt> Tlatša polelwana ye e latelago: Mathieson o ile a tsenela ERA E-Type le Leslie Johnson bjalo ka mootledi, bakeng sa 1949 Richmond Trophy, Jersey Road Race le British Empire Trophy, gotee le  <response>: Moputso o Mogolo wa Brithania wa 1950. Methopo e mengwe e bolela gore tše ke dikgatišo tša semmušo tša ERA ka gobane Johnson o be a rekile motšweletši wa dikoloi nywaga e meraro pele ga moo. Mathieson o ile a reka Frazer Nash Le Mans ya dilitara tše pedi yeo a ilego a thopa phenyo ya sehlopha sa gagwe ka diiri tše 24 tša Le Mans ka 1950 gotee le Richard Dickie Stoop. 