Lewis Hamilton has been urged by David Coulthard to ‘lead by example’ after the seven-time world champion demanded more transparency from the FIA over the sport’s recent scandals. F1 is going through a rocky period off track with president Mohammed Ben Sulayem at the centre of an investigation he allegedly interferred with some race results before he was ultimately cleared. Both Susie Wolff and Toto Wolff were the centre of a short investigation by the FIA amid claims of a conflict of interest. That investigation was swiftly dropped, but the managing director of the F1 academy has now lodged a…