In 1966 Attwood competed in Australia and New Zealand as a part of BRM's Tasman Series squad. His Tasman performances were very promising, including a win at Levin, but despite this – perhaps due to his underwhelming 1965 Formula One performances and growing success in sports cars – Attwood sat out the majority of the and Formula One seasons. His only appearance came as a substitute for works-Cooper driver Pedro Rodríguez at the 1967 Canadian Grand Prix, bringing the Cooper-Maserati home in 10th place. During 1966 he maintained his run of form in Formula Two, taking victory in the Rome Grand Prix and a second place at Pau in 1966, but concentrated firmly on sports cars in 1967.