What a destroyer leader adds to a flotilla

What extra equipment and facilities did a destroyer leader carry?

It carried extra accommodation, radios, medical support, and command spaces for the flotilla staff.

The response frames a leader as a command platform rather than merely a larger destroyer. It must berth the flotilla commander, staff, additional communications ratings, and other personnel beyond the ship's normal complement. Extra radios and dedicated working spaces let that staff receive information and coordinate the flotilla. Expanded medical and accommodation facilities support the larger headquarters while it remains mobile with the destroyers it commands.