[Kas63]

So... Been trying to find time to investigate adding a second fog light for a while. My initial investigations concluded that you can power a second rear fog light from the existing one without generating a fault code or diminishing the brightness of the fog lights.

Took a little digging but I was able to route a new cable from the new left fog light, into the boot by the battery. There is a convenient earth stud here so used that for the fog light earth. I then followed the existing wiring loom to the right side cubby in the boot.

I identified the correct wire to the existing fog light in the wiring loom (Yellow - red trace), tapped into it and it worked.