The Royal Navy's likely post-E-class cruiser

What cruiser might the Royal Navy build after the E class under this alternate treaty?

Probably something like an enlarged County-style reconnaissance cruiser with 9.2-inch guns, alongside an earlier evolution toward a Leander-like light cruiser.

The historical County class was itself shaped by the actual treaty ceiling, so the alternate limit changes its starting assumptions. British pre-treaty studies already included larger 9.2-inch-gun cruisers. A navy facing more battlecruisers would value a powerful reconnaissance ship, although it still would not be intended to fight capital ships. The lighter branch of protected- and armoured-cruiser replacement could develop toward a Leander-type design sooner.