Mezue ahịrịokwu na-esonụ: N'afọ 1964, Reg Parnell Racing malitere ịgba ọsọ nke 25, na-eji BRM P56 V8 engine, na obere ihe ịga nke ọma. Chris Irwin tinyere Reg Parnell Racing 25/33 ngwakọ nke asaa n'ọsọ ikpeazụ ya na World Championship na
1967 Dutch Grand Prix, ebe ihe nlereanya ahụ bidoro afọ ise gara aga.