Brace Position
I speak (nay, write), under correction, but I am sure that, post-Kegworth, the CAA (?), issued a circular about the brace position, giving new advice that was gently critical of some of the previously assumed 'best positions' as one contemplates one’s crater-to-be...
At that time, I was working for a major transnational that had its own aviation division, and those of us who spent a lot of time in aeroplanes were given a copy... I am not sure if it’s still in my filing system, but I can have a hunt if that'd help the PPRUNErs... probably there is some reference on the document...