[Keith]

They can't use that justification for radio on a TV platform though when they're justifying moving TV channels online.   And as we see in Scotland removing the radio channels can free up space for two TV channels on PSB1. 

With the radio stations there's also alternative ways of listening, such as smart speaker, mobiles, and of course physical radios.

There's no advantage with de-regionalising, the only reason that was done on satellite was because everything was going onto one transponder. The coding and multiplexing kit for PSB1 exists already and is fairly new, I don't think there'd be any real advantage in reducing it's use.

Potentially an advantage would be to encourage users to switch to the HD channel version, whilst making those with older TVs aware that their TV wasn't compatible and needed an external device or upgrading.

This would be useful if they were planning to convert PSB1 to DVB-T2. Considering they've not yet renewed PSB3 it's feasible they might want to move their HD channels onto PSB1 to save costs, leaving just BBC One on PSB3 due to that multiplex's English regions support. Paying whoever then takes over PSB3 to transmit BBC One would presumably be cheaper than the cost of running the entire PSB3 multiplex in addition to PSB1.