Ku qor sii wadida faqradan - Sanadkii 1974, Postlethwaite wuxuu u naqshadeeyay kooxda gaari cusub oo cusub, Hesketh 308, kaas oo diyaar u ahaa Silverstone International Trophy, oo Hunt ku guuleystay, isagoo ku soo bandhigay horyaalkiisii ugu horreeyay ee Grand Prix ee Koonfur Afrika. Baabuurku wuxuu ahaa mid xoog leh, isagoo kaalinta saddexaad ka galay abaalmarinta Grand Prix ee Sweden, abaalmarinta Grand Prix ee Austria iyo abaalmarinta Grand Prix ee Mareykanka
Waxaad Sannadkii 1975, tusaalooyinka 308 waxaa loo iibiyay Harry Stiller Racing, oo siiyay Alan Jones kulankiisii ugu horreeyay ee Grand Prix. Gawaarida Polar Caravans ayaa sidoo kale iibsaday Hesketh chassis, halka kooxda shaqada ay wax ka beddeleen 308 ee Hunt. Isla mar ahaantaana, Horsley wuxuu isu beddelay maamule koox tayo leh oo karti leh waxaana hogaamintiisa hoosta ka xariiqay in kooxdu horay u socoto.