What I mean by the AAIB "tearing you to pieces", is looking at exactly what you have been doing as flight crew. They will look at every aspect of your life to see if there were physical or mental issues that could have effective your flight. They will look at your rest and flying schedules. That is what i mean, not in the literal term that they will hold you accountable. They will simply look for every piece of information to find out what happened. If somewhere you have fallen fowl of the rules, then that is a leagal body that will take it further.