From the Bentley manual:
1. Remove front bumper.
2. Remove headlights.
3. Remove kidney grille.
4. With engine hood open, remove the front grille panel retaining screws at either side of the radiator. You may have to remove the air filter housing or duct to achieve this on the left side.
5. Remove the front panel retaining screws near the hood latches.
6. From underneath the car, remove the retaining screws on the left and right sides of the front grille panel (this is why you have to remove the bumper and headlights).
7. Remove panel.