orca, you want an investigation into an investigation? Then so do we both! Not only of the Cunningham accident, but of the Mull of Kintyre, the Tornado blue on blue, and many others. It isn't my satisfaction that is needed but that of the NoK and other loved ones who have been lied to repeatedly by the MOD.
This isn't a game, a debating society wherein point scoring and bon mots win the day. This is about discovering the truth and then fearlessly exposing it, no matter how much it embarrasses the Star Chamber or HMG. This is about the saving of both life and treasure, and keeping the Service airworthy. You don't do that by holding back in an SI report, knowing that saying that the aircraft was unairworthy will mean the unwelcome involvement of the PuS.
Or was it simply an oversight? A lack of a safety case clearly implies the lack of airworthiness, doesn't it? No need to dot the I's. Job's a good'un.