BBC News and BBC World to merge

[Mr Q]

I suppose editorially the stories they’ll need to make a careful judgement on are things like the Plymouth shootings in August 2021. Unforeseen, big breaking news in the UK, with little interest for the wider world. 

Instinctively you’d want them to opt but in reality I think World viewers will have just suck it up. And even if it has more of an international agenda, it will be hard for those journalists in NBH watching Sky go to town on their coverage to say no.

I think that's exactly the type of story which would warrant a domestic opt-out. I'd imagine that it's the sort of story that would break on (global) BBC News first - a mass shooting isn't irrelevant to an international audience, as we've (unfortunately) repeatedly seen in the context of the US. Then, after a period, you would pull in the necessary resources to be able to continue with rolling domestic coverage as required.