Why a British battleship successor depends on foreign programmes

What would a Royal Navy successor to N3 or G3 look like?

It cannot be specified in isolation because British choices would respond to the ships and threats produced by every other major navy.

The Royal Navy would select the attributes it considered best for the mission and threat environment of the time. The relevant questions are what the United States, Japan, Russia, and Italy have built in this counterfactual world. Even completion of projects such as the Francesco Caracciolo class could change the comparison. Each foreign decision produces further industrial, tactical, and diplomatic consequences. By this stage the design problem contains fifth-, sixth-, and seventh-order effects, so a confident single answer would conceal the scenario's uncertainty.