Lab Queen, lets get a few things straight here:
First off, it was the responsibility of the safety case, not Cannard, to identify potential hazards. Liability over the failings of the safety case have been admitted and fault lies with this body not with Cannard. Up until the day of the hearing, Cannard or any of the groundcrew or aircrew, had no knowledge of the existence of the safety case. If the existence of the safety case was known, why was it not uncovered in the exhaustive research performed by Tapper's Dad and his supporters?
A Safety Case is not responsible for anything. Responsibiity and Authority is vested in people, not paper. The responsibility for the Safety Case lies with the IPTL and the RTSA. See JSP553 for details.
The Nimrod Safety Case has been actively discussed on here for some time, and certainly long before the findings of the BOI were announced.
Why did the aircrew and groundcrew know nothing of the Safety Case ? Part of the wider problem I'm afraid. see the other Nimrod thread for the discussion.
S_H