Forced to replace my front number plate today due to it being demolished by a flying plastic wheel cover smashing into it A camper van coming the other way lost the cover as it passed me- massive bang as it hit the lower bumper / number plate.
Like most owners I'd also noticed the holder was a bit loose but now it was very loose. Drilled out the rivets (poor fixing method IMO) and replaced the holder using S/S bolts. A bit fiddly getting your hand in behind but not too bad a job.
Relieved that the projectile didn't hit the car higher up!