If Britain's 1939 battle fleet became Vanguard class

How quickly would Britain overwhelm the Axis if all its 1939 battleships became Vanguard-class ships?

No precise timetable is given. The counterfactual could destroy German and Italian surface forces much earlier, reshape North Africa and Crete, and change the conditions facing Japanese planners.

The premise replaces Britain's 1939 battleships, while excluding its battlecruisers, with Vanguard as completed after World War II. That gives the fleet modern radar, improved heavy-gun fire control, Mark 37 anti-aircraft control and ships capable of keeping up a high speed at sea. Scharnhorst and Gneisenau could face destruction during the Norwegian campaign, while Italian battleships would have much less chance of escaping British forces. An early defeat of the Italian surface fleet could disrupt the North African campaign and leave an assault on Crete more dependent on airborne troops. Vanguard's anti-aircraft systems would also make attacks around Crete more dangerous. Iron Duke and Centurion are raised as possible additional transformations, depending on how broadly the premise defines British battleships. The consequences are judged large enough to change Japan's calculations, without producing a specific date for an Allied victory.