Well I managed to sort the wheel out so the scratch is barely noticeable using 3m fast cut plus, so I'm happy to leave it. I could probably get rid completely but it's cold and I can't be bothered at the moment!
I usually take the dealers around the car to show no damage, take photos etc but I trusted these guys as it's been in with them so many times (when I first got it) for quite a while, with lots of work done e.g. new water pump, clutch, etc and they know how OCD I am

Unfortunately I guess I have to go back to showing them around it/taking photos, like I did with my Audi before this.
It's probably lost them a sale too as I won't go for a Mk7 now and think I will give another brand a go, possibly a m135i which I test drove or A45 AMG which I want to see in the flesh when they make it over here, or perhaps I'll go back to Audi and give another dealer a try