I had to replace one of mine a couple of months ago - similar story got back from a great day out and found a hole in the glass dead centre of the NS fog light I picked up a replacement off eBay for about £20 - bargain I think there are a couple for the pre- face lift on ebay at the moment.
Replacement is very simple through the access panel in the wheel arch liner. 3 posidrive screws and the bulb connection. Should take about 1/2 hour all in.
I did jack up the front corner and remove the wheel for better access.