10mm (collective) in the "A" "zone which is 290 mm from the centre of the steering wheel, at the end of the day it sounds to me like a new screen BUT it is at the testers discretion like loads of things ... the amount of claims for a windscreen depends on the company, ring there glass line and they will tell you , word of warning , it may be better to have it done instead of it failing its MOT , because depending where you take it they may charge you a re test fee if not back in a given time frame ....