"Performance Plus" is the enthralling story about the Rootes Group's Sunbeam Alpine success at the 1961 Le Mans 24-hour race. The film focuses on the pairing of Peter Harper and Peter Proctor in their '3000 RW', number 34, Sunbeam Alpine, which performed faultlessly over the 2,194 miles of the 24-hour epic. They finished second in class, 15th overall, achieving an average speed of 91mph and securing the coveted 'Index of Thermal Efficiency' prize.