In 1955 a radical redesign of the cockpit was made, prior to that year's Le Mans outing. Further work in the Bristol wind tunnel had shown that, despite a slight increase in the Cd-value, the reduction in frontal area as a consequence of removing the cockpit roof resulted in an overall reduction in the car's aerodynamic drag. Instead of the previously all-enveloping, twin-finned roof, a wrap-around screen and single large tailfin were employed, in a manner very similar to the 1955 Le Mans-winning Jaguar D-Type cars. The compulsory second seat was still in place, but was covered by a solid tonneau.