Kammala jumla mai zuwa: Hakanan a cikin 1971, "Stichting Autoraces Nederland" (Gidauniyar Gasar Motoci a cikin Netherlands) ta ɗauki hayar Surtees TS7 a gare shi don yin wasan farko na F1 a cikin GP na gida inda ya gama na takwas mai daraja a cikin GP mai ɗumi sosai. A shekara mai zuwa Van Lennep ya lashe 1972 Rothmans European Formula 5000 Championship yana tuka Surtees TS11 da McLaren M18. Ya kuma tuka sau biyu don ƙungiyar Williams GP, inda ya sami maki na farko na Gasar Cin Kofin Duniya tare da matsayi na shida a cikin 1973 Dutch Grand Prix. Tare da Ensign, ya zira kwallaye na biyu a
1975 Grand Prix na Jamus, wanda ya sa ya zama na biyar mafi nasara a cikin Dutch Formula One bayan Max Verstappen, Jos Verstappen, Carel Godin de Beaufort da Christijan Albers.