I ended up buying a new one, as I couldn't really be bothered with the hassle and aggravation of dealing with a seat
dealership.
When I arrived to pick it up from David Cook Motors, I asked one of the tech's to give me some pointers on replacing it. When walking up to the car, he pointed out that the drivers side one had a small crack as well
I think I'll wait till my next service and bring it up with the
dealership then, see if I can get it replaced free while I'm their. If not, I'll probably end up replacing it myself if it gets any worse.
Anyway, when replacing the passenger side one this weekend I noticed something weird when removing the light. One of the metal fixings that line up the light with the car had snapped clean off:
http://imgur.com/a/GKptI
All I can guess is that something like that couldn't happen without considerable force. I've defiantly not hit anything, and I struggle to see how anyone could have hit the light without leaving a mark on the paint work. Has anyone else noticed this?