Four powerful 1937 capital ships reset the naval arms race

What changes if Incomparable, Conqueror, Thunderer, and St Vincent suddenly join the Royal Navy in 1937?

Britain's fast capital-ship force roughly doubles, provoking rival redesigns and probably shortening the King George V program in favor of more powerful Lion-style battleships.

This alternate-history scenario gives the Royal Navy Incomparable, Conqueror, Thunderer, and St Vincent as operational ships in 1937; it is not a claim that the four entered historical service. Incomparable could take Hood's place while the other three serve as powerful fast battleships, raising Britain's fast capital-ship total from roughly three to seven. Germany, Italy, Japan, and the United States would all have to reconsider capital-ship plans, while Scharnhorst and the Littorio class would face a much worse balance. King George V and Prince of Wales were already laid down in January 1937 and would probably continue, with Duke of York also possible because she had already been ordered. The later Anson and Howe orders could instead give way to a more powerful Lion-style design carrying at least nine 16-inch guns. Advanced fire control, radar, and anti-aircraft equipment on the four added ships would widen the disruption beyond gun caliber and speed alone.