Talk Morgan Forums Morgan Sports Cars Morgan Plus Four, Supersport & Plus Six (CX & CXV Generation Vehicles) Cracked windscreen on a plus six

I have a crack on passenger side top on my windscreen.
I have two questions - approximately how much is this going to cost to replace?

Secondly I do t remember it happening whilst I was driving so does anyone know if putting the roof up can cause this?

Thank you in advance

Greg