Wierd, I have just gone down to do this myself as I leave for mainland Europe on Thursday and I can't find the lever either. Is it on both sides of the car and is this procedure still relevant for 2007 facelift coupes? There is no mention of being able to do this in the manual so I am not sure if this feature has been removed!? It says that you need to be qualified to do any work on Xenons that is all.
I managed to undo the plastic cover in the wheel arches, but not fully remove the hard plastic light cover under the wired clip.
Not sure what I am doing wrong. Can anyone help??