McLaren's Lando Norris set the pace in a floodlit second practice session at the Singapore Grand Prix on Friday with Ferrari's Charles Leclerc close behind but Red Bull's championship leader Max Verstappen only 15th.

F1 live updates from the Marina Bay Street Circuit as Norris flourishes and Red Bull struggle in Friday practice

F1’s regulations limit the amount of flexibility permitted, but teams try to find ways to maximize this to improve performance.

The FIA intervenes following intense scrutiny of McLaren's controversial rear wing design, which rival teams claim breaches aerodynamic regulations.

SINGAPORE (Reuters) -Formula One leaders McLaren will modify the rear wings on their cars after talks with the governing FIA at the Singapore Grand Prix following concern from rival teams. The British-based team went top of the standings in Azerbaijan last weekend but drew scrutiny of how the rear wing functioned at speed,