I have continued to investigate the issue and I'm gaining confidence that I have the wives properly sorted out.
As the wife listed for B-300 is manifestly incorrect, that leaves very little substance to his bio, other than the history of the Byron property in Lancashire, which would also apply to B-14.
B-14's profile is pretty sound, if the reference to a first wife, Alice Strelly, is removed. She was the wife of B-299, and the mother of the next Sir John, ie, B-14.