FL - thanks for your clarification to the word 'should' in your summary - I thought that it was actually from the original.
But JAR-OPS 1.085 (e) actually states:
A crew member shall not :
(1) Consume alcohol less than 8 hours prior to the specified reporting time for flight duty or the commencement of standby;
(2) Commence a flight duty period with a blood alcohol level in excess of 0·2 promille;
(3) Consume alcohol during the flight duty period or whilst on standby.
There's no 'should not' anywhere in those regulations - clear and unequivocally it is a 'shall not'! I note also that it isn't just '8 hours bottle-to-throttle' - it's 8 hours prior to reporting!