To his credit, George Russell is putting on a brave face. Crouching down for the now customary post-race team celebration photo, surrounded by dozens of colleagues in aqua blue ‘P1’ t-shirts, the Mercedes driver is smiling courteously, doing his bit for the greater good. In front of the microphones and dictaphones, too, the Briton is showing no signs of feathers being ruffled. On the contrary, after finishing off the podium for the second consecutive race while his teenage teammate Kimi Antonelli claimed his third successive victory of the season in Miami – opening up a 20-point world championship lead in the process – Russell’s message was clear. “To be honest, I’m not even considering it (the gap),” he said. “Clearly, Kimi’s in a really great place at the moment and momentum is with him.…