<prompt> Bhala okuqhubekayo kwalesi sigaba - UWalker wanikezwa isihlalo seFomula One sesikhathi esigcwele sokushayela iLotus 72 ngesizini ka-1972, njengomshayeli wesibili ku-Emerson Fittipaldi. Kodwa-ke, njengoba isizini yayiqhubeka, bobabili uWalker nethimba baqala ukudumala. Ngemva kokuba iLotus ithole ukuthi uWalker wayevivinye imoto yeFormula Two yeqembu elihlukile, wasuswa eqenjini le-GP yase-Italy  <response>: ne-GP yaseCanada, lapho athathelwa khona indawo nguReine Wisell. UWalker wayebuyele emncintiswaneni wase-US, kodwa wayeka. 