A Lion successor would follow its gun choice

What would succeed the Lion class if Plan Z had gone ahead?

It depends on the Lion's final armament; a 16-inch choice could lead toward a larger Conqueror-like successor.

There is no single inevitable follow-on design because the Lion class itself was not fixed independently of its armament. Retaining a 16-inch weapon would make a larger, Conqueror-like successor plausible. A different calibre would change turret weight, magazine needs, protection, and displacement. The chosen gun therefore drives the layout and development path rather than merely being fitted after the hull is designed.