JFZ90; Can I draw your attention to what the "educated" BOI said about the Nimrod Safety Case (2-22):
"NSC is a body is a body of evidence that assures that the aircraft is safe to operate within the Statement of Operating Intent and Usage. It is a suite of documents providing a written demonstration that risks have been reduced to As Low As Reasonably Practicable (ALARP)"
That body of evidence does not exist, and that is why the fuel system is not ALARP.
I fully appreciate that QinetiQ/Boscombe will not use "acceptable" lightly. But they also know the implications of using the term "broadly acceptable", and they do not use it.
DV