Hi Googies,
I asked my local dealer the same thing about retro fitting front fogs to my Toledo.
The kit is about € 250 in the ROI, but for some dumb reason SEAT did not bother to prewire the car for front fogs (at least the reference model), so there is a fair piece of wiring work to be done including behind the dash, along with switch fitting, and a relay. They have done it a few times on request from customers but charged a total of €500 to cover the entire job including the kit, as there was allegedly several hours awkward work involved, plus VAT of course. They are not that keen on doing it again, unless the customer is very insistent about it.
I didnt fancy shelling out €500 for what is really just a cosmetic enhancement...although they do look nice !