Well this changes things. For all his faults re licensing etc, it seems the pilot's last moments may have been spent heroically trying to put the aircraft down in a controlled fashion knowing he was about to loose consciousness.....although we'll never know for sure.
I wonder why this information has only been disclosed now. I presume the CO concentration in the passenger's bloodstream was discovered during toxicology testing from the post mortem....i.e. 6 months ago.
Surely this information would have warranted the wreckage being recovered for examination....but 6 months of saltwater immersion won't exactly make finding the fault in the aircraft easy now.
I have the greatest respect for the AAIB, but I do wonder if budgetary considerations are having a negative impact on some if their investigations these days. It is now clear that wreckage should have been recovered at the time.