Nash was part of the 1974 England team, where he won a bronze medal for the 4×100 m medley relay at the 1974 Commonwealth Games in Christchurch, New Zealand. He also won a silver medal for the same event for Great Britain at the 1974 European Swimming Championships in Vienna, Austria. He won 100 m butterfly event at the 6 nations tournament in Minsk, USSR in 1976.