[boggissimo]

I was changing my brake disks last night and have some pads too but didn't swap them yet (want to see what difference the disks make first). I noticed that on the box for the pads it says 'For racing use only' although that may just be because they haven't had some sort of official test/approval to be able to sell them for road use. The same sort of thing was on the box of my coilovers!

I expect the legalities are more basic in terms of whether your car has sufficient braking ability to be considered safe on the road, but don't know for sure.