Choosing F3 for wider 15-inch fleet improvements

What changes should an Admiralty adviser advocate in 1924 for the O3 battleship design, or should Britain choose F3?

The preference is to argue for F3 and the 15-inch/50 gun because the gun and turret work could also improve existing ships.

The proposed case favours F3 over adjustments to O3. Its 15-inch/50 gun could offer an upgrade path for other British ships. Work on the mountings could also allow older 15-inch turrets to fire at higher elevation. The argument therefore values benefits across the existing fleet as well as the two new battleships.