Great story!(adding my humble praise to everyone else's)
So, with suitable humility, and in the interests of helping give this TL the perfection it deserves, re:
in OTL at least, even though it was the Battle Cruiser *Fleet*, it would seem, by no means inappropriately IMHO, that Beatty did not in fact enjoy C-in-C status in this command.
Rather, the online copy of Jellicoe's "The Grand Fleet", at https://www.naval-history.net/WW1Book-Adm_Jellicoe-Grand_Fleet.htm#7 at what appears to be p.203 refers to Beatty's designation as "Vice-Admiral Commanding the Battle Cruiser Fleet".
Cheers, and keep up the great work!
Thank you, glad you are enjoying it.
To some degree, my use of that phrase is lazy shorthand for to avoid repeating myself.
You are correct, the man in charge of the BCF was never officially 'C-in-C'. Beatty was subordinate to Jellicoe, and the BCF was technically part of the Grand Fleet. I haven't changed that in the story.
However, there are rather a lot of ifs and buts in there, as Beatty did act with considerable independence, both personally and professionally, and the simple fact that he was at Rosyth and Jellicoe was at Scapa meant that orders and reports tended to flow to/from London rather than through Jellicoe. It's fair to say the two seem to have worked reasonably well together, but Beatty was often testing the limits.
In the story, he's just been given 5BS, so he would almost undoubtedly feel he had even more of a fleet than he did OTL.
There's one of the contradictions about Beatty - he did try to encourage independent action and thinking among his officers (although not always very successfully, it has to be said). However, when he became C-in-C Grand Fleet, he rather brought the BCF back into the fold, renaming it the 'Battle Cruiser Force'