Which French ships did the Royal Navy miss most?

What did the Royal Navy miss most when much of the French Navy was absent from Allied operations in World War II?

French large destroyers, judged here the most valuable missing capability because they were the closest Allied counterpart to the Tribal class in the Atlantic and Mediterranean.

French large destroyers rank highest in this assessment of the capability the Royal Navy lost when much of the French fleet ceased fighting alongside it. They offered the closest Allied counterpart to the Tribal class in the Atlantic and Mediterranean. Their surface-combat strength made them useful whenever they became available. The timing of that availability determined whether the Allies could use them when they were most needed.