It has shown up quite a bit on Facebook, Twitter, and the UK airshow forums.
Nick Grey (of The Fighter Collection) was flying the aircraft at the time, and was entering into a display routine that he had already practiced flying in the aircraft earlier this week. According to Nick Grey, he was indicating 360kts (or roughly 414mph) at the time the plexiglass canopy separated. The plexiglass was the only thing that departed - the canopy frames were still attached to the rails. In some photos posted elsewhere, it appears that the right-side of the canopy separated from the framework (roller assembly) which ended up splitting and shattering the canopy into many pieces, all in a split second. Some moderate sized pieces dented the vertical fin and dented and bent portions of both sides of the horizontal.
https://www.youtube.com/watch?v=t6LmJvCmMhEhttps://www.youtube.com/watch?v=jZL9ypaoVNwA photo capturing when it happened:
http://forums.airshows.co.uk/viewtopic.php?f=8&t=78017(The suspected "crack" in one of the photos is just a reflection, as you see in many photos of this plane)
https://www.flickr.com/photos/123146806 ... 56/sizes/l