Zyder
Thank you. I entirely agree.
I was trying to interpret Graydon's misleading letter to Sir John Grandy. He made no effort to distinguish between the excellent organisations you mention, but in the context of what he was discussing I believe he meant the AAIB; because the RAF always cited the AAIB report as evidence of absence of technical failure, when of course it said no such thing. Tony Cable made it his business to clarify this to Lord Philip when giving evidence.
The main point is that his (Graydon's) words were intended to deceive Sir John into thinking there was independent support for the gross negligence verdict against the pilots, when there was none. The only question in my mind is how many years such an offence warrants.