When Queen Elizabeth II might receive a ship name

Which is more likely first, HMS Queen Elizabeth II or HMS Princess Diana?

A Queen Elizabeth II commemoration is possible in a future strategic-submarine class, while Princess Diana is unlikely without a much larger wartime demand for names.

Princess Diana is an unlikely ship name unless a major war creates demand for a much larger list. Queen Elizabeth II is more plausible because the Dreadnought-class submarine King George VI already commemorates her father. A new strategic-submarine generation could use her name, but the serving carrier HMS Queen Elizabeth creates a risk of confusion and may outlast that submarine generation. Naming therefore depends on class conventions and the service lives of existing ships as well as the prominence of the person commemorated.