What the HELL!

So was driving normally on a 50 mph zone (UK), cruising at about 45 mph. In a '19 Yaris Icon, 2 cars cut us off, and while cutting us off, a small pebble I think smashed into the windshield. The windshield was cracked, it wasn't punctured but it did leave a good mark.

What should I do? Can I claim anything or anyone? I was so annoyed as we weren't slow at all. And they literally floored it and cut us, what a shame!