The Type 31 frigate as a modern sloop

Will the Royal Navy develop a new sloop based on Coast Guard cutters such as the Legend or Hamilton class?

The Type 31 already fills much of that role: it is a globally deployable presence ship whose function resembles a modern sloop.

The Type 31's mission matters more here than its frigate label. It is intended for persistent global presence, with less emphasis on the highest-end fleet combat tasks. Its initial armament is light, while its planned deployment pattern is recognizably sloop-like. An older warship type can survive as an operational function after its name disappears.