Thanks for the info, the scratches can be felt with your fingernail, in fact it's down to the metal by the wheel arch.
I was doing a ton when it happened, then all of a sudden I heard banging against the side of the Car, it was dark, and I didn't realise what it was at first, until I noticed the driver mirror missing, about 10 seconds later.
It wouldn't have been so bad if it happened at like 30mph, but that air speed has caused it to smash into the side of the Car quite violently.
I ordered a new mirror online for like £10, so got that stuck on straight away, had like a self adhesive backing.
I've been to one of those chips away places, they said it needs a re-spray on the drivers door and rear quarter panel, and I'd be better going to a proper body shop. They reckon about £400 - £500. Absolutely gutted!
I've only had the Car just over 12 months, and had to replace the water pump and thermostat housing 6 months ago, which was £500. Getting a bit annoyed now if this is another fault which has happened to mine.
It's a 2015 plate by the way on 50,000 miles