Its illegal to use fog lights when there is no fog around, nothing to do with "technically" Mike
Hi , the fog lights have been converted to drls using the " http://www.ringautomotive.co.uk/uk/products/Cars/Accessory+Lighting+-slash-+Styling/Accessory+Lighting/BRL0402 " quite simply replace the inside of the fog light with these round drl`s which actually DIM on side lights at night and if you need them as fog lights in fog then run the fog light circuit live wire through a 5 pin switch over relay making the drl`s inside the fog light bright when the main or side lights lights are on by switching off the auto dim feature .Many vehicles have round etc drl`s where these fog lights are so now the fog light itself has been removed and just the empty lense is there then there completly legal as there not fog lights anymore but can be used as fog lights if needed .Thank you.