A quote from ELSA:
Side grille on bumper cover: removal
Remove front bumper lining
The grille is held by seven clips.
Remove retaining clips -1-. Start with clips at middle of bumper.
Remove the grille, towards the centre of the bumper.
Fog lights: removing and installing
Remove the front bumper moulding grille (above)
Rotate the fog lamp 45° counter clockwise
Remove the fog lamp from the bumper moulding and release the connector.
Removing and installing a bulb for fog headlight
Remove fog lamp (above)
Turn the fog lamp connector 45º counter clockwise
Remove the lamp from the fog lamp housing
Pretty well engineered I must say.
You need to dissasemble half of the car to get a bulb changed