[Jimbo2022]

Yes there's still a 'network' or 'sustaining' BBC1, and as you say there's actually two as there's a north one too. 

What they carry when I can't remember. It's still London (or South East) for Breakfast and a selected region for Politics/current affairs. It always used to be the news channel for the news opt outs, it might be London sometimes since they moved into the national studio (that might have been a temporary thing)

If a region doesn't opt or fails during it then you'll see whatever's on that sustaining network version. However, every TV and radio service goes through coding and mux and they can replace any region with another. So if a region  can't do an opt and they know in advance they can have another one nearby go out in it's place. Handy functionality, especially during covid. 

They also have the ability to join regions, so if a programme is going out in several they don't all have to be crewed just to put it out

So playout put out 4 (I think) versions of BBC1 - sustaining, sustaining north, SD nightlight, and HD. Yes as far as I know the old HD version with the red caption still exists, but only appears on iPlayer.

Thought so thank you. And Nightlight is downscaled hd with different red slate and an overlay. I assume the overlay us not on the other 8 as they are probably downscaled HD feeds and would need routing differently if a slate appeared on BBC2 for example 

I wonder what will actually happen on 8 Jan, and at what time? 😊

Thanks