Had the donk stopped before his landing?
I'm not sure what purpose the AAIB report will serve, to be honest. It will catalogue the series of accidents-waiting-to-happen that eventually did happen, it will give us transcripts, show his track, demonstrate his poor pre-flight planning, poor judgement etc., but to what end? Most who read it will laugh, and those who will make similar mistakes in the future probably won't even read it.
It'll cost £1,000s, be completed with utmost professionalism by the AAIB staff, but will it prevent another similar incident? No, because AAIB have countless others in the files, and they didn't prevent this one.
I'm sending him an email asking if I can use his Lotto numbers, though