So sorry for the delay, but the weather change was battling with my immune system for the past days.
Anyways, today I got underneath the car with a screwdriver and camera. I also got so much dirt in my face I regretted not having ever cleaned underneath my car!
There's three screws to be removed, as shown:
Close-up of screw 2
Opening these screws will allow a small protective plastic panel to be removed:
Now you will have access (slightly restricted) to the fog lamp housing from the rear.
View from underneath:
This sealing rubber is easy to remove and put back later. Keep in mind that this does not fully detach, but only comes off the main housing.
Behind this rubber is the mechanism for removing the bulb itself, I could not take a picture because it was hard to fit the camera at a suitable angle, but it is the exact same locking wire mechanism used for the headlight bulbs.
Also, beware that these are H3 bulbs, so both wires (+ve and -ve) have to be disconnected individually and are not at the base of the bulb, but connected to a ~5 cm. wire leading away from the base.