cazatou:
failure whilst complying with your authorisation would not result in such a finding.
And therein lies the dilemma, Caz. Since W&D's findings it has emerged, though presumably all ready known to them, that this aircraft and its sister ones were fundamentally unairworthy. These were experienced SF qualified SH pilots. No explanation has been given, other than by Walter, as to why they should go charging off into granite centred IMC rather than continuing as per their authorisation.
AFAIK nobody's girlfriend lived on Mull, so bang goes that theory! I don't have a theory. I only know that I find W&D's theory incredible and thus their consequent findings unjust. We may yet discover what led these pilots to the action that they took. If so it is very likely to appear to have been an act of desperation rather than of gross negligence.