I do not have that odor of exhaust in my disco
I have the same Issue!!It happens intermittently but more frequently when the car is sitting still with the engine on.
Are you sure it wasn't anything you ate?I do not get an exhaust fume smell, however, I do smell something else (almost like eggs?) ONLY when the re-circulation is turned on. Perhaps this will go away after the car is broken into as it is still new?