MP, no need to point anything out to me, I read the report and the RECOMENDATIONS. Neither of which indicate blame.
At the end of the day someone missed the screwdriver. So who is to blame the crew who borrowed it without permission or the trainee without tool control? You could perhaps describe this as "falling below the standards set by CAA regulation"?
I would say there is an element of shared blame and being an ace pilot does not prevent a mistake having been made.
I have no axe to grind, just taking a disspassionate view about the situation.