Well, looks like I have something to do this weekend.
Driving home last night, I suddenly heard a scraping sound. I pulled over and found that my front lip had fallen off and was dragging on the road. I didn't have a screwdriver to re-attach it then and there, so had to completely remove it.
I think it wasn't helped by the front being so low. It sits about 120mm (4.75") off the ground, and the road outside my house is undergoing repairs, so there is a lot of piles of loose gravel on the bumpy road. I guess the front lip must have taken a bit of a beating acting as a bulldozer over the past week and finally gave up.
One of the perils of owning a car with a low front on New Zealand roads.
Oh well, at least it gives me an excuse to work on the car. :-)