I think stupid panoramic sunroofs must be playing a role in this (combined with the terrible condition of the roads). Mine just got cracked (it's covered via the windscreen insurance), but I'm told it'll cost them so much to replace that it's effectively a write off - and my car must still be worth around £2.5k! Still waiting for the final word on it, as Autoglass called me to say I wasn't insured, and Admiral then assured me that I was.