[Kojak]

Well, no, you're absolutely right. After the move to N6, Peter Sissons insisted on presenting any network bulletins that fell during his NC shift, which made perfect sense, and as you say, should have been done across the board. He thought the same as you do - that the 'musical chairs' thing was pointless. 

I think the reason what you suggest can't be done with the Six or Ten is that BBC London comes from the same studio? It would probably be a tall order to power up studio C for 25 minutes and have the presenter rush there with such a short lead time. Though saying that, it might be good if perhaps whoever was down for each network bulletin did an hour of UK news before (say, 11-12, 3-4, 8-9?). Just an idea - I haven't really thought it through.

Sorry, edited my post. I added a piece about moving BBC London to studio D.

I never knew Peter Sissons insisted on doing that - kudos to him!

He wrote about it in his memoirs (HIGHLY recommended BTW - a great read).