Somehow I managed to crack all the corner of my windscreen today! Will it pass an MOT? How much for a replacement? Its an mk3.
Thanks in advance 
You should be OK for an MOT pass if it's in the corner. Read S.8.3
http://mottesters.co.uk/files/special%20notices/MOT%20Inspection%20Manual.pdfTo summarise. Zone A is the important test area. Then the swept area of the wiper blades is a secondary consideration.
REASON FOR REJECTION.1. In Zone ‘A’: a. damage not contained within a 10mm
diameter circle, or
b. a windscreen sticker or other obstruction
encroaching more than 10mm
c. a combination of minor damage areas
which seriously restricts the driver’s view
In the remainder of the swept area: d. damage not contained within a 40mm
diameter circle, or
e. a windscreen sticker or other obstruction
encroaching more than 40mm
f. a temporary windscreen fitted.