I completely forgot to mention that my article on the genesis of Beasts and Super-Beasts was published last October in the journal Articles, Notes and Queries (ANQ).
It examines the differences between the versions of stories published in periodicals and the revised versions collected in the book. I trace the writing and publication history and speculate a little on the reasons for the changes.
The article can be found here, though access is unfortunately not free: https://www.tandfonline.com/doi/full/10.1080/0895769X.2021.1979929
Gaston, Bruce. “Reconstructing the Original Beasts and Super-Beasts by ‘Saki,’ or How a Short Story Collection Took Shape.” ANQ: A Quarterly Journal of Short Articles, Notes and Reviews. 12 Oct. 2021. Online: https://doi.org/10.1080/0895769X.2021.1979929 (08.02.22)