I sometimes think we actually need three Fora now:
one on Answerbank, where people smugly congratulate themselves on completing the puzzle
one here, discussing the intricacies of the end-game
and another here, for duffers like me, who still haven't got the completed grid.
Still stuck on 34ac - I seem to have 3 vowels in the checked spaces
28d - is this a famous drug? If so, why?
11d
Then I can start the end game - so far, I've just got a slight hint of the message formed by the extra letters