I read the AAIB report prior to reading this thread. It is interesting that several people have the same impression as me, that this report was not the best ever researched and written by someone in the AAIB. I have generally been very impressed by the AAIB's work, I went on a 2 week accident investigation course a few years ago and was very impressed by the calibre of people from the AAIB.
I know nothing technically about flexwing aircraft so cannot comment about that part of the investigation, but I think there were far too many general comments not strictly anything to do with the accident and too much personal opinion. The investigator did the AAIB a great dis-service by trying to lump together trivial admin rule infractions with major airworthiness issues. To a mindless bureaucrat who knows no better, then not fitting an "admin" placard might be the same as not carrying out some essential maintenance. However I would have thought that an AAIB engineer would be able to differentiate between the two. Does he really want to bring down all improtant safety issues to the level of fitting a placard that is there to protect someone's arse in the CAA and has no bearing on how to operate the aircraft or its airworthiness.
I am not a BMAA member, I have occasionally flown in a microlight. Ive found it great fun and most microlight fields Ive visited have been well run and machines seemingly well maintained- often looking in a lot better condition than the average public transport C of A club Cessna or Piper!! From my experience I would say that there are the odd maverick in all forms of aviation, probably most are involved with public transport C Of A aircraft.