[James2001]

Before Huw read the announcement on BBC One and NC, the picture was already showing the palace flag lowering to half-mast…

And just before that, they had a shot from a camera in the crowd where everyone suddenly starts looking up and pointing their phones- presumably when they noticed the flag being lowered. Then they cut pretty abruptly from that to the Balmoral gates almost as if they weren't meant to be showing it.

The BBC website has a video of the "announcement"- which begins with the News Report slide from the moment they cut into BBC2, though Huw had actually already announced it on BBC News and BBC1 a good couple of minutes before that, I don't know why they didn't include that bit on their video seeing as it's the actual moment we were told.