An F3 layout creates a recognizable British capital-ship family

What changes if the County class is built with an F3-style layout?

Britain gains a distinctive common silhouette across major ships and may use the layout to make the treaty battleships slightly faster.

The historical County silhouette helped it resemble British battleships at distance. An F3-derived family would preserve that recognition effect while giving major British ships a deliberately distinctive national profile. Nelson and Rodney could use the unused margin between their actual displacement and the treaty ceiling to support the new arrangement. A somewhat longer hull and altered length-to-beam ratio might also yield a small speed improvement without abandoning treaty limits.