8 hours bottle to throttle is a nonsense when the limit is (rightly) 20mg/dl
That may be the legal limit, but for me personally, and almost everyone I know and in our flying club, there is only one figure . . . . . ZERO !
The AAIB accident report to which you gave the link above is a timely reminder to all of us of the still complex nature of flying even a simple aircraft, and just how easily that skill can be fatally diluted.