Thanks all, very helpful insight. We've been quoted £1,100 (plus Vat) to change which, if I'm honest, is lower than I thought it would be. Still crazy money and I'm still frustrated that this could have been caused by my 6 year old daughter's head. As for insurance, this is most unlikely to respond. Most insurers specifically exclude Panoramic Glass Roofs from the "glass" section of the policy. However I've been looking closer at this and while it may be excluded from the beneficial terms of the glass section (no excess (if approved persons repair/replace) and protected no claims), I think it's arguable that I'm covered by the general damage section of the policy. There is no specific exclusion (or cross policy limitation) and I would just have to suffer the excess in the usual way. I'm going to make that claim. If that fails I think there's something to be said for the failure to draw the panoramic glass roof exclusion to my attention when I bought the policy. The insurers were aware of the exact specification of the car (including its 'roof'). Had they brought it to my attention I would not have purchased the insurance. It's a material item to cover and thus a materially relevant exclusion.