Existing battleships offered the faster wartime route

If Britain had accelerated HMS Vanguard, how quickly could she have entered service?

Possibly on roughly the suggested schedule, but accelerating the more advanced King George V-class battleships would have been easier.

Extra effort might have brought HMS Vanguard into service on roughly the proposed schedule. Accelerating the 14-inch King George V-class ships would still have been easier because their construction was further advanced. Wartime procurement depends on how much work has already been completed. The most desirable finished design may offer less immediate value than a ship that can enter service sooner.