[Stooky Bill]

Kind of

There's a 'network' BBC One - in fact there's two these days as there's a BBC One North. This has News Channel in the regional slots (except during Breakfast where there isn't a News Channel) and for programmes like Sunday Politics and This Is England it has one of the regions programmes.

The England HD version and the new SD Nightlight version are essentially opt outs of the network - blanking the regional news. It's just instead of it being an opt out from a regional studio they're just additional outputs from the playout automation.

However with the roll out of HD regions and the increasing integration of BBC London into the national news operation I think London will soon be the default as it was pre-2000. The big difference these days is that if a region can't do it's bulletin then, because its all centralised, there is a way to switch region A's outpit onto region B. There's less chance of London News appearing elsewhere