What might future Royal Navy submarines be called?

What might the future Royal Navy Orca submarines be called?

B names are plausible after Astute, while an O-class revival is also possible because of its Anglo-Australian history.

The Astute boats have used A names, so B names are one possible next step. The suggested pool includes Basilisk, Beagle, Brazen, Brilliant, and Broadsword, drawing on destroyer names as well as submarine practice. The Dreadnought ballistic-missile submarines show that letter sequences need not govern every new class, since capital-ship names have been chosen for those boats. O names are another suggestion because of the earlier association between O-class submarines and Anglo-Australian orders. These are possibilities discussed for the future, with no settled naming scheme claimed.