DV, glad to hear that you obtained a copy of the BoI that you wanted. I'd just like to make a general point here that there is a natural tendency (I experienced it myself when our squadron suffered a fatal accident at our own airfield) to 'own' such a tragedy and resent any outside intrusion. That is natural, but we are all professionals and must know that cannot be so. Every accident, especially a fatal one, has lessons for the whole aviation community and, as RD and others have already stated, those lessons have to be discovered by thorough investigation and then disseminated throughout the whole community, not only within the Service but outside of it too. This is done by BoI's/SI's and in the case of fatal accidents, Coroners' Inquests/FAI's. That the latter were ever excluded in the case of deaths of UK serving personnel was a glaring anomaly, now resolved thanks to the OP.