Thanks everyone, for your comments and thoughts.
I've got Autoglass coming on Friday to change it. I did put in the notes section of the web form "Could I please have a genuine windscreen?", but not heard anything one way or the other.
I would have called them but the website was very light on phone numbers or ways to talk to actual people!!
I'll see on Friday what happens!!!
The most annoying thing is the day it happened my wife and I couldn't decide whose car to take, she has a 66 plate Scirocco GTS with lots of chips in the window from its previous owner, she said she wished we'd taken her car as she wants anew windscreen!
Anyway will let you know how it turns out!
J.