Former F1 boss Bernie Ecclestone says he would be concerned by the rise of Formula E if he was still in the role which he is most famous for.
Ecclestone took control of the series in the 1970s and held a position of power until Liberty Media's takeover in 2017, which saw him given the honorary role of chairman emeritus. The Brit was a critic of the existing V6 hybrid engines, which have been controversial, and last year suggested F1 considered going electric in order to stay in line with direction being taken by the motor industry.
His view has changed over the last 12 months and he now thinks the all-electric series, which is currently in its fourth season, is on an impressive upwards trajectory.