I’d just like to make clear the ‘bile’ was slightly off topic. My original point was that the alarmist tone and style of the messaging was a bit much (there is a screenshot of it somewhere in here.) Particularly to be showing it 7 hours after the story had originally broke. I was simply saying that I - like many others, it seems - assumed something else had happened and switched to check. Basically there was no need for click bait on a channel for pre-schoolers.
I agree with you, OP, and I think some people have rather misconstrued and stretched what you said. I thought exactly the same.
Yes, it's major news, and I think it was right to take over BBC1 for it (not sure about the others, though - they could always have swapped any potentially 'sensitive' content).
The big clanger that the BBC dropped was having such a massive banner, for so long, on a channel made for young children - especially so many hours after the sad, but hardly shocking, news had broken; and making it look like it could be something urgent and catastrophic for the nation. Even if they did have to have it on there so prominently and for so long, they could have said 'Major Royal News on BBC1' or something.
It isn't the same as when Diana died. Aside from the nature of her death and her very young age, things were very different in 1997. Nobody had smart phones or social media, internet access was very limited and many could quite conceivably not have heard for hours afterwards.
Regardless of whose death it was, young children cope with death in different ways and at different stages. It's up to the parents to shield them, guide them and inform them at the right time and in the right way for them. As for the PP saying that the world doesn't revolve around young children, that's true; but CBeebies DOES.
A lot of the viewers might have very old and/or very ill (great)grandparents and been very worried to see the news flash, especially if they'd vaguely overheard people mentioning that 'he's died' elsewhere. Tiny ones live in tiny worlds and they wouldn't necessarily understand that news of their (non-famous) grandparent's death wouldn't interrupt the news in the same way.
As for the concept of 'breaking news', the BBC are really in danger of crying wolf and overusing the term to the point of it becoming meaningless. Yesterday, their news website had a massive 'BREAKING' banner at the bottom - and the 'shock breaking news' was that Prince Charles had expressed great sadness at his own Father's death 
By all means continue to expand on important stories (on appropriate channels) for those who want to follow the developments, but in the modern world, a big story like this is no longer a surprise to anybody 6 or 7 hours after it's been reported, unless it happens overnight, maybe. It's still important news: just no longer 'breaking' or in any way a shock.