TREADIGRAPH.
In the case of the SF260, the cause of the injuries, propabaly more than anything else, would be head injuries caused by a very sudden deceleration, which wearing a bone dome would not alleiviate.
I too saw the T.34C accident at Mildenhall. Sadly the first of 11 over the years. I have always felt very guilty about it, because, during his original display, which I didn't feel was flown particularly well [only a PPL myself, but have seen much display flying], I remarked to my friend that I wasn't too impressed. On his next take-off, to fill in,he inverted at about 600 feet. I remarked to my friend 'I bet the guy in the back is having kittens in there'. Ten seconds later, as you know, he killed himself and his pax. Chryptic remark by me. Should have kept my mouth shut.