Compare with the accident involving G-XCEL - the cause in this case is known, but the report still hasn't been published by the AAIB. My understanding (and I'm sure friends of Ian, James or Neville will correct me if I'm wrong, and I'll edit my post if required) is that there may be legal action in the offing so the report is not being published until that is settled.
So an accident four months later which involved someone of interest to the media with no published report - not a conspiracy, IMO, just process.