(30 Jun 2022, 10:43 am)busmanT wrote Nexus could, of course, secure Metro replacement bus services to provide a night service over the Metro routes if they thought they would attract passengers.

Exactly this. If there was enough demand or "social need" then NEXUS would cover the Metro routes using "N" buses, like London with night buses shadowing tube lines. That was, until the late 2000s the extent of night buses in London anyway!