 Kọ itẹsiwaju fun paragirafi yii - Pẹlupẹlu ni ọdun 1971, Stichting Autoraces Nederland Foundation for Car races in the Netherlands bẹwẹ Surtees TS7 fun u lati ṣe ifilọlẹ F1 rẹ ni GP ile rẹ nibiti o ti pari ni kẹjọ ti o ni iyin ni GP ti o tutu pupọ. Ni ọdun to tẹle Van Lennep gba 1972 Rothmans European Formula 5000 Championship ti n wakọ Surtees TS11 ati McLaren M18. O tun wakọ ni igba meji fun ẹgbẹ Williams GP, ti o gba aaye akọkọ rẹ ni Agbaye Agbaye pẹlu ipo kẹfa ni 1973 Dutch Grand Prix : ó ṣe tán. Pẹlu Ensign, o gba aaye keji ni 1975 German Grand Prix, ti o jẹ ki o jẹ awakọ Dutch Formula One karun ti o ṣaṣeyọri julọ lẹhin Max Verstappen, Jos Verstappen, Carel Godin de Beaufort ati Christijan Albers. 