Would the Royal Navy benefit from supercruisers if it were allowed to build them?
Short answerYes; they would be useful against Deutschland-class raiders and the varied large-cruiser threats fielded by other navies.
NotesThe Royal Navy would benefit if treaty or political limits allowed it to build supercruisers. A ship of that scale would be useful against Deutschland-class raiders and the disparate large combatants developed by Germany, Italy, and Japan. Enough ships would be needed to cover several distinct threats rather than prepare for one perfect duel. The operational case rests on fleet coverage and opponent diversity as well as the qualities of the individual design.