After taking the British Formula Renault Championship title in 2007, Duncan showed his versatility in 2008 with drives in World Series by Renault, Superleague Formula, A1GP, the Le Mans Series, Porsche Carrera Cup and Time Attack.

In 2009, after competing in the first two rounds of Firestone Indy Lights in the USA, Duncan is putting all his efforts into finding the necessary funding to continue the season.