Very conventional single-seater, equipped with the classic Cosworth engine and Hewland gearbox, the Theodore TY01 was designed for the 1981 F1 season by Tony Southgate. Teddy Yip's team often managed to shine with Patrick Tambay. Three examples of the TY01 were built, which were also used in 1982. In addition to Tambay, Marc Surer and Derek Daly also drove the TY01.