A Super Lion response to Yamato

How would Britain answer Yamato if Japan revealed her before the war?

By building an enlarged Lion-class battleship, potentially armed with four quadruple 16-inch turrets.

If Japan disclosed Yamato before the war, Britain could continue rather than pause a large response already under construction. The expected answer is a Super Lion with twelve or perhaps sixteen 16-inch guns, with four quadruple turrets within British design practice by that stage. Revelation in 1938 matters because construction could begin before wartime priorities halted or delayed the largest capital-ship projects. Knowledge of Yamato's scale could provoke an enormous British reply before the strategic value of battleships was reassessed.