The information this morning goes like this.
Doctors became concerned Thursday night.
Just before 7am, Charles requested that the Queens helicopter be flown to Scotland (he was staying at Dumfries House, Ayrshire) and he started to make his way to Balmoral. Anne was staying with her mother already. Camila was at Charles Scottish residence and made her way by car.
Charles arrived at Balmoral at 10.37am. He and Anne were with their mother when she died.
Sometime around noon the call must have been made to make the statement about her health.
Whats interesting is the timing of the flight from Windsor to Aberdeen for the other Royals. It seems to only have been arranged after noon.
They didn't attempt to go to Balmoral before then. So despite there being significant concern from Charles prompting him to go Balmoral the others didn't go. We know Charles had been seeing his mother daily over the summer though. So clearly there was significant concerns.
It looks like Charles probably was party to the call being made to tell parliament too.
So it sounds like the Queen must have gone downhill quick but had a few hours were she was very sick - enough time for Charles to get there.
The fact the other Royals dashed to Balmoral suggested they did TRY to get there in time. But they already knew it may be too late - same as the rest of the world. Or they already knew it was too late.
The PM being told at 4.30pm does fit the narrative that she died mid afternoon rather than earlier and whilst the other royals were en route.
I don't think anything suggests much different. Everyone knew she was dying by lunchtime.
Even my 8 year old was astute enough to say 'so she's going to die today' when I told him the Queen was sick at 3.30pm after school.