Chadwick stormed away from pole position to take a commanding lead into the first corner, while Irina Sidorkova hung around the outside of Beitske Visser to take fourth.

Further back, Ayla Ågren and Fabienne Wohlwend ran wide – the Norwegian slowed suddenly and caused Wohlwend to hit the back of her car, launch into the air and broke her front wing in the process, requiring a pit-stop.

Sabré Cook meanwhile had made up five places from the start but began to fall back through the field as Miki Koyama overtook her for 13th, not helped by her side mirrors bending from an impact with a kerb.

Chadwick eased to victory with a ten-second gap to title rival Powell in second.

Series returnee Caitlin Wood started and finished 17th after some mechanical issues on the rear end of her car led to misaligned tracking.