Was Britain still producing 15-inch guns in 1939?
Short answerYes; some new 15-inch guns were still being made, and many existing weapons could be reconditioned.
NotesA British 15-inch gun pipeline still existed in 1939. New weapons were being produced to support the battleships that already carried the calibre. A larger pool of guns was also available through reconditioning. In this scenario, that supply could support a 15-inch conversion for Anson and Howe, accelerate Vanguard, or arm later Lion-class designs. Hull, machinery, and industrial constraints would remain, but access to the established weapon was not the limiting factor.