A modern Royal Navy still dominates without submarines or nuclear weapons

How effective is the modern Royal Navy in the world wars if it has no submarines or nuclear weapons?

Still overwhelmingly effective because its carriers, aircraft, sensors, and conventional air-defense weapons remain generations ahead.

The narrowed counterfactual removes modern Royal Navy submarines and nuclear weapons from an intervention in either world war. Even so, Queen Elizabeth-class carriers and F-35B aircraft remain almost impossible for period forces to counter. Radar-directed 4.5-inch guns and modern 30 mm systems would also inflict severe losses on contemporary air attacks. The answer therefore treats sensors, fire control, and conventional aviation as enough to preserve the modern fleet's out-of-context advantage.