The AAIB are known throughout the flying world as impartial reporters. They absolutely never allocate blame.
However, they are world leaders in the use of diplomatic language. Those who understand diplomatic language will surely be able to get the drift of what the experts really think when the report is published.
Who knows, Biggles might even be able to gain the odd crumb of comfort from the report and will, no doubt, be offering tree-landing courses for a very modest fee in the grounds of Hampton Court Palace or the Deer Park, Richmond having been totally exonerated (in his own mind).