[interestednovice]

Red screen on BBC One HD from Crystal Palace during the London evening bulletin.

Sounds like earlier on may have been a test to see if their new routing was working correctly - with London already getting separate routing to other regions, they may have broadcast the red screen to every other region but not London. Off-air observation could then confirm that everything was set up correctly.

Test completed successfully, and since the launch is actually tomorrow, perhaps they are now just leaving the slate up for all regions a few more times!

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The “network” feed was always derived from BBC One London anyway, so it is not surprising in a way.

Not really sure what you mean

The England HD version of BBC One is a seperate variant to BBC One London and both are different to the 'network' version of BBC One. 

The latter carries some London news bulletins but is not derived from it, London opt out of it. 

The UK wide SD service 'nightlight' is essentially the same as the soon to be discontinued HD England, just with a different caption wording

What I meant was that BBC One HD, previous to these technical changes, on Freeview in England was a “network” feed which filled most gaps with generic content but sometimes used London. This is how BBC One Network appears to work - when Breakfast is shown on the News Channel, London opts appear. So London is not, strictly speaking, “Network” but could be described as the “default” region. As such, if the “Network” version is not produced correctly (such as they forget to play out the “Coming up on the BBC News Channel” during the regional headlines opt) London content appears.

Where BBC One HD differed from Network itself was provision for things such as a rotating set of Sunday regional political programmes, to better allow it to serve people across England. This created a “BBC One England”, available only in HD, which was arguably not a true network feed although for practical purposes it was indistinguishable from one.

I think we really are on the same page but you perhaps disagree with some of the wording I’d used. I apologise if anything I wrote was confusing, I didn’t intend it to be. I think it’s just a difference of semantics.

I suppose what I had meant really was that BBC One HD (England) wasn’t conducted as a separate operation akin to BBC One Scotland HD - it was a copy of Network BBC One in HD with some slight differences, more akin to BBC English region differences than a whole different playout operation.