This is the unseen side of the Tour de France. I'm only a few yards behind the riders, and, from here, I can see their backs twisting, their thighs churning, as they slog, buck, heave and grind their way up another monstrous Alp. I'm in the car, a Jaguar XF Sportbrake. Now, getting into Jag's new estate is a world-exclusive in itself, but, today, that is rather overshadowed by the fact this is TeamSky's lead support car, the nerve centre of the whole team, so they say.