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... should be 'maybe' in last sentence!

I think there's only one way to adjust the entries which works.

The endgame was pretty quick for me, but then I remember the work from my university days. One of the first things I learned in my ... course. (Don't want to risk a spoiler.)

Concerning the preceding debate, there does seem to be only one way that will work to give the requisite names. Certainly, once you have identified the most likely rows, the changes are forced.

Back in 2016 I think this setter was responsible for the infamous 'hare'.For me, no such problems this time. Thanks Poat

Nearly done, and I have the message and the title and writer. However, I'm puzzled by 22down- it seems that the adjustment has no material effect on the clue or the message.

Am I missing something?

there’s no anagram indicator in 22d so the adjustment is necessary for the clue to work

re my earlier post - mea culpa - I was getting off track with one row's alterations - I agree with others that the endgame gives a unique answer. Apologies

Excellent puzzle; the adjustments made the gridfill a real challenge, the final adjustments were unambiguous and the “leads” were generous enough to allow me to find the author and treatise which would otherwise have been well beyond my ken. Thank you, Poat.

Thank you also to fellow forum members for the kind thoughts on last week’s Listener thread. I am pleased to say that my daughter is now at home and her cardiologist is confident that she will make a full recovery.

thanks Candledave, it makes sense

Have completed the grid bar 24d and I reckon I have identified the title and author of the treatise.

No idea which entries to adjust so will have to leave it there, bit of a shame but so be it.

Some very nice clues along the way even if completing the grid (almost) did end up a bit of a grind.

Better luck next week!