All these arguments seem to miss the elephant in the room - The UK MoD mindset is fixed over Crown Immunity and the official policy for Crown negligence has not changed in a century: "Deny, deny, deny, obfuscate, obfuscate, compensate - then continue to deny."
You will never get the guilty to admit they caused and injury or death when the Crown policy forbids that. They will simply repeat the official mantra when in a court of law. Unless you change that policy, the Crown and its servants (us !) will continue to behave in a non-accountable manner in regard to duty of care. I understand the principle of what Graham and the team are trying to achieve here, I just hope they have a few Ministers and PUS in their sights if they want to make a real difference to government sanctioned negligence.
With the MoD it's never a conspiracy, it's always rank incompetence, which often makes the outcome worse.