(30 May 2020, 2:31 pm)Michael wrote True but atm, it doesn't have "Frequency reduced until demand returns" next to the changes, like the 56 and 60 does, so i think that means, the whole service will stay every 30 minutes for the foreseeable future.
Which can also be inferred from the fact that the extra Streetdecks for the X21 have been diverted elsewhere. It seems likely to assume that 6303 may well be repainted and rebranded to make up the 8th bus in the PVR. Though this is probably not a necessity atm, and plans may change in the future so for the time-being I imagine one of the corporate branded 6301-3 will permanently be allocated.