Nice present...

Gutted for you mate that not wat you need over the christmas holidays! Hope you get it sorted!
 
Vandals or some kind of stress fracture caused by the extreme cold? All you need on Christmas day... good luck sorting it out for the New Year!
 
I got gritted the other day and the crack does have a tiny chip in it, so I assume I got the chip from the grit and the cold has turned it into a crack?
 
So gutted for you mate.

I had a chip in my windscreen once, some guy from RAC came and filled the chip in, then within 3 hours massive crack.

The guy left me his phone number, and said "£30 for a new windscreen - don't do it through your insurance, I can get them cheap"

Stolen, obviously lol

Gutted mate, yes the chip can turn into a crack if the car hits sudden bumps in the road etc, and with wider ranges of temp changes, it can stress it more.