John, you're probably right, in that the technical investigation wouldn't assist those running a fleet of aircraft - the normal outcome, and the "legal liability" exclusion (I didn't think it was a SA only concept, M609) as I said, probably explains the presentation of a catalogue of organisational failures, rather than a discussion. Chugalug, I meant accident investigations, and specifically AAIB ones, not RAF boards of enquiry, but if I remember, the Kintyre board produced a report which was reasonable and competent, it was what happened to it afterwards that caused the furore.