In a heated battle for third place in the latter stages of Saturday's first of two races at the ExCeL, defending series champion de Vries was attempting to keep a hard-charging Cassidy at bay and fought at close quarters until the end.
Despite his Envision rival's best efforts, Mercedes driver de Vries was able to clinch third at the line - and an incident investigated where de Vries was alleged to have moved under braking was given no further action.
