Choosing a ship for an early combat information center

Which Royal Navy ship would make the best testbed for an early combat information center?

A cruiser, because it provides enough space to evaluate a full organization before scaling down.

A cruiser offers enough room to test a combat information center at realistic scale. A staff of perhaps thirty can reveal how much space the organization actually needs. Designers can then identify what matters before attempting to shrink the arrangement for smaller ships. Testing first on the cheapest cramped hull risks blaming the concept when lack of space caused the problem.