[Robert Williams]

I think the unhidden bbc1 network IE what would happen if no red slate happened would be

Breakfast - London
Lunch - News Channel (Sportsday)
Evening - London
Late - London
Weekend - News Channel
Sunday Politics as broadcast

No I think its News Channel for everything except Breakfast. Its what you see if your regional news fails mid-programme or with no notice, which thankfully is fairly rare

Surely it is now BBC London at 6.30 and 10.30?  Ever since it moved to Studio B last October, London viewers have had a gap of about two seconds before the regional news starts, whereas the regions begin much more quickly, as does Sportsday, implying that it is London that is now carried on network at those times.

A few weeks ago there was an occasion when BBC London began much more abruptly than usual, and Scotland and Wales both caught a quick glimpse of the London presenter before their programmes started.

Additionally, during the headlines sequence, the final national headline caption can still be seen sliding away when the London presenter has appeared on screen.  Sportsday continues to be the default at lunchtime.