The report says everything from the AAIBs (and CAAs) point of view, in that they expect manuals to be kept up to date and in line with current trends, experiences and regulatory requirements. It seems that they expect Spitfire manuals to be the same (And I would assume that they are, too.)
As a reflection of the Thunder City EE Lightning's findings I find it really quite surprising that this aircraft was as apparently badly maintained as it was, given the publicity if the Lightning and Gnat reports - it points to someone willingly and completely ignoring their own situation for the 'fun' of airshows or, more realistically, the money earned from them. Meaning that those companies that rely on airshow income might be most at risk of cutting safety corners and endangering their hosts and spectators.
As an aside, from the way this report is worded, it will spark off a movement to ban vintage jets from all UK airspace...that would most likely be closely followed by an equally extensive EASA ruling...I hope not , but the words speak for themselves.
Another thing to note that this report is full of the "sideline FIndings" from the investigation and none of this report's items seems to be a cause of the Crash...which is still to be determined.