Best COA for an exploded sunroof in the UK?

I experienced a terrifying event the other day. While driving on a motorway almost as fast as the speed limit, panoramic sunroof of my BMW spontaneously exploded with a huge noise. It's a 3.5 years old SUV, all windows and sunroof closed at the time, everything is factory-fitted and I'm a very cautious and safe driver. Thankfully, I didn't panic and cause a serious accident but instead stayed calm and pulled over.

My car is now in a BMW service pending an initial investigation. Even if the damage is repaired, this is a much more serious problem in my opinion and I will never feel safe in a car with a sunroof from this point.

I am not a British citizen and have lived here for a few years - so friends living in the UK: what would be your best course of action in an event like this? I would highly appreciate any advice you may have!

PS: This is how it looks like just after the incident: https://imgur.com/a/gFVHnCL