ok it's easy
1. Inner wheel arch plastic guards: remove the lowest screw that holds these on (it goes into the lower bumper). I think it's a star head, but i used an allen key.
2. Splitter: Remove the splitter. A handful of screws which are accessed from underneath the car.
3. Lower bumper: Remove the lower bumper in a similar way to the spitter. It will also have some plastic attachments which hold it to a plastic radiator surround.
4. Now the foglights will be exposed for you to remove them.
Pic with lower bumper removed:
I'm not sure what the foglights themselves are attached with as I've retro-fitted mine. Haven't wired anything up yet though.
Hope that helps.
PS, Make sure to get the plastic grille surround too.