Tuhia he haere tonu mo tenei irava - I te tau 1971, ko te "Stichting Autoraces Nederland" (Foundation for Car races in the Netherlands) i utu i tetahi Surtees TS7 mo ia ki te mahi i tana F1 tuatahi i tana GP kaainga i reira ka mutu ia i te tuawaru i roto i te GP tino makuku. I te tau e whai ake nei ka wikitoria a Van Lennep i te 1972 Rothmans European Formula 5000 Championship e taraiwa ana i te Surtees TS11 me te McLaren M18. I eke ano ia i nga wa e rua mo te roopu Williams GP, i whiwhi i tana tohu tuatahi mo te Toa o te Ao me te tuaono o nga waahi i te 1973 Dutch Grand Prix. Ki a Ensign, i eke ia ki te tohu tuarua i te 1975 German Grand Prix
, ka waiho ia hei tuarima o nga kaihauturu Formula Kotahi angitu o Netherlands i muri i a Max Verstappen, Jos Verstappen, Carel Godin de Beaufort me Christijan Albers.