Woke at 5:30am and I've now finished it except for 2 little ones at 34d & 41a (last two cells of the grid)
Not fullt understanding the clue at 42a aristo, if it doesn't sink in, I'll ask for a parse at a later date.
I Haven't seen a mention of the preamble outcome from you guys yet so not sure if you have finished the task to end up with a numerical answer to place at the bottom of the grid on the line.
I thought it was very subtle and the compiler has excelled himself with this.
Anyway, I have found the answer and I have a 2 digit number, however, it may be one more for the count because of my two unsolved clues, because looking at the surrounding area of the clue, there actually could be one more but I've checked those words and can't find any appropriate Def.