I see, thanks! I am not sure if the bumper lights are considered equivalent to rear fog light in Spain....
I have been reading various official technical documents for the UK and EU models. What I found out is that the part numbers of the body controller, the body controller diagrams, and the harness for the liftgate lamp (where the rear fog LED and reverse LED are located) are all the same. From this, I have started to think that perhaps simply replacing the liftgate lamp might solve the issue. However, one thing I am unsure about is whether software changes are necessary. There are people who have brought US models to the EU, and they have enabled the "euvehicle" option using a toolbox. I am not sure if such a step is necessary or if the UK is included in the EU, and that is the point I am uncertain about right now.
FYI
Body controller (ES) 1010907-00-G
Parts Catalog
Body controller (UK) 1010907-00-G
Parts Catalog
Diagram (LHD) página 29
https://service.tesla.com/docs/Mode...e2012/s-lhd-sop11/2018.1_ModelS-LHD-SOP11.pdf
Diagram (RHD) página 29
https://service.tesla.com/docs/ModelS/ElectricalReference2012/s-rhd-sop12/2019.1_ModelS-SOP12.pdf