As well as constructing their own sports racers, JBW also prepared and entered Cooper single-seater racing cars for Naylor to drive in Formula Two and occasional Formula One events.
Ademais da construción dos seus propios automóbiles deportivos, JBW tamén preparou e entrou automóbiles Cooper de carreiras monoprazas para que os pilotara Naylor en carreiras ocasionais de Fórmula 1 e Fórmula 2.