All done, but I still can't see the parsing for either 14a or 23a (and maybe in other, ambiguous cases we should specify whether it's the clue or the entry number that we're referring to) - but no doubt the light will come.
I would like a hint to the parsing of clue 25d - I'm sure of my entry which satisfies the definition, sure of my extra letter, but
cannot see the local mother, if the daughter follows the usual convention.
Doing the necessary Wiki search for the Author, initially drew a blank until I remembered Wiki's rather prissy insitence on correct diacritical marks - a bit like the Chambers app's frustratingly pedantic requirement for terminal full stops before it will reveal the meaning of some abbreviations.
The crucial element of the design for the final appearance of the grid became obvious through my strategy during the cold-solving phase of listing my answers grouped by length, to aid spotting crossings - not by reading the message, or the synopsis of the play - that came much later as reverse engineering.
Clue 19d was easy for me as we had a ceremonial visit from one every year at my old school - one year it was the Queen, and she spoke to me: " Worms, Ma'am" I replied.
Very clever, and fun - thanks Demoniacal.