Turn wheel on opposire lock fully as this gives more acess
Remove wheel arch liner (dont need to remove fully just 3/4 screws enough to pull it back)
Fog light is held on with 3 bolts inside - may need to feel your way around with one of the bolts as its at an angle
Undo, unplug wiring and fog light comes out from the front
see my how to of bolt locations
http://www.e90post.com/forums/showthread.php?t=638171