The can of worms seems to be the maintenance documentation, the inspection work that wasn't carried out that should have been or a variation applied for, life expired parts being fitted, no variation applied for and items not replaced when replacements did arrive. The airframe was not airworthy to the standards and procedures deemed necessary to the MPD the airframe was issued the permit to fly against in the eyes of the AAIB. The CAA disagree as stated in their reply. Someone is wrong somewhere. I suspect more worms will be found in other facets of this accident.