Fourteen-inch guns are preferred in this counterfactual, though the Royal Navy's 13.5-inch choice still made practical sense. The weapon was already approved, tested, and supported by an established ammunition system. Changing calibre would have affected the supply system as well as the gun itself. The counterargument is that moving to 14 inches on Tiger might have supported a larger calibre step for the ships that became the Queen Elizabeth class.
Notable Point · 36:03-36:41
The 13.5-inch gun as a logistical choice
A preference for 14-inch guns is balanced against the Royal Navy's practical reasons for retaining a proven 13.5-inch weapon and ammunition system.