Excellent 5 questions dalek, now we await the excellent 5 answers, and wait, and wait, and....
That John Purdey, Olive Oil, et al see no conflict between the concept of no doubt whatsoever and the mere opinions (your word Olive) of two men (not backed up by any Rules or Regulations for the simple reason that they could not prove that any such Rules or Regulations had been broken) would not matter one jot except for the fact that they thus seek to justify the improper processes of the Military Air Accident Investigation and the Military Airworthiness Authorities, aka the Services (the RAF in this case) and the MOD respectively. That they wish to nail their case to that mast is their affair. I would only say that if ever the CAA and the AAIB were implicated in the improper granting to an unairworthy aircraft type of a CofA and the subsequent finding of manslaughter against the deceased pilots of a crash involving that type with no proof (ie proof!), there would be a national scandal. The fact that some 17 years after the event these particular Airworthiness and Accident Investigation authorities have yet to be the subjects of such a national scandal is a scandal in itself. 17 years is more than enough. Enough now! Let Right Be Done!