I have some notes on duty of care, but can't access them until the end of next week. Will look them up and post as and when.
Just to clarify some points on BOI and CM: since the Mull accident, BOIs are now administrative procedures to determine the facts and cause of an incident, without allocating blame, in order to avoid a repetition of said incident; CMs are disciplinary procedures that follow on from a police investigation. Evidence from a BOI should not be used in a CM unless the defendant has perjured himself.