Five World of Warships Yukon battleships appear in 1939

How would five fully crewed World of Warships Yukon battleships appearing in Canada and Australia in 1939 change the war?

They would reinforce the Royal Navy, improve the Norwegian campaign, strengthen Mediterranean deterrence, and reshape later battleship choices.

The question imports the World of Warships Yukon, a hypothetical 15-inch-gun King George V variant, into January 1939 rather than treating it as a historical class. The ships arrive fully crewed, but the Canadian and Australian navies could not independently sustain them, so they would operate within the wider Royal Navy system. Adding five fast battleships raises British and Commonwealth capital-ship strength from roughly sixteen to twenty-one, close to the stated requirement of twenty-four. Three available for the Norwegian campaign could maul Scharnhorst and Gneisenau, while the remaining ships strengthen deterrence against Japan and in the Mediterranean. If German naval losses and a worse Norwegian outcome free more British strength for the Mediterranean, Italy may reconsider entering the war and a larger carrier force could make Taranto still more destructive. The extra battleships would also alter later choices among Anson, Howe, the Lion class, and Vanguard.