[Kojak]

Good point about D being in a separate fire zone, I always seem to forget that, although has it ever actually been used for that purpose?

I initially thought that Studio B would be more expensive to operate than C/E, but the BBC said B required less power. I suspect the One moving so late is down to a mix of who produced it and the usual BBC inconsistency.

Is it back to having it's own production now then rather than being a news channel production considering the news channel now exists in name only and is essentially a World production. 

And yes of course running a news channel is more than just the presenter but baffling we now are back to having anchors in to just do a half hour shift.  Doesn't even seem like the One presenter is on standby for the breaking news service, though perhaps if something did warrant a news report on BBC1 now depending on the story they may be more inclined to use the network presenter rather than just opt into the news channel.

It's not a half hour shift, though, is it? The presenters are in the building several hours beforehand to prepare for the One. Much of what they read from the autocue, they write themselves. They will also be liaising continually with reporters to coordinate any live crosses. I do agree that it would be good if they stayed on for a couple more hours and helped provide some form of UK-only rolling news - but I also accept that the capacity for that may not be there at the moment.