Pedzisa mutsara unotevera: Mathieson akapinda muERA E-Type naLeslie Johnson semutyairi, nokuda kwe1949 Richmond Trophy, Jersey Road Race uye British Empire Trophy, pamwe chete ne
Mubairo Mukuru weBritain wa1950. Mamwe manyuko anotaura izvi sezvinonyorwa zvepamutemo zveERA nokuti Johnson akanga atenga mugadziri wemotokari makore matatu akanga apfuura. Mathieson akatenga 2-litre Frazer Nash Le Mans umo akawana kukunda kwekirasi muna 1950 Maawa makumi maviri nemana eLe Mans pamwe chete naRichard "Dickie" Stoop.