How many large destroyer leaders survive to 1939

If every Shakespeare- and Scott-class flotilla leader had been completed, how many would remain in 1939?

Their larger hulls make modernization and retention more likely, but the total depends on how many active flotillas still require dedicated leaders.

Size gives the leaders more margin for new weapons, sensors, and machinery changes than smaller destroyers possess. That makes individual survival more plausible, but navies retain ships to fill roles rather than simply because modernization is possible. The 1939 total therefore depends on the flotilla organization the Royal Navy chooses to maintain.