Agree with Biggus, real problems with physical evidence, I doubt the BoI will be able to state the cause of ignition with any certainty. An enormous amount of work has been done since the crash to remove venting, hot air, etc etc. Various ideas have been put forward and the leaks have continued. Sadly, none of the executive at Kinloss are pushing fuel tank protection and are sleep walking into an unsuitable AAR system for the replacement.
I have just read the BoI for the Lynx, it is so heavily redacted it is not worth publishing. I have heard what people are saying about the crash and I would suggest it has been heavily redacted for reasons other than simply national security.
I have much more faith in the Inquest. I have taken a small part in the Inquest for XV179, and I am confident that a root and branch investigation is now taking place including an examination of the wider picture.