The BBC National news on the telly almost always consists of no more than four or five items daily. You can watch it at 8am (on the BBC News channel) and discover what the contents of what the remaining bulletins will be, including on the 6pm and 10pm main broadcasts on BBC1, for the rest of the day. Only if something exceptionally newsworthy happens during the day (such as the Westminster incident) will those items change. If you relied solely on the BBC news then would be under the impression that nothing happens in the UK between 8am and midnight.
Then, when you watch the local news, if any one of the chosen stories for the day has a remotely local connection (like one of the participant’s grandmother’s friend’s cousin being raised next door to him thirty years ago) , it will be explored “in more depth”. (In practice this means the same clips as were shown on the National news, but voiced over by the local presenter). Many items in the local “news” are simply magazine items that could have been compiled any time in the past three months.
The 8am news on Radio 4 begins either “The Prime Minister will announce in a speech today…” or “Education Secretary Justine Greening will set out the government’s plans today…” or something similar. Not things that have happened, but things that will, details courtesy of government press releases. These topics are then carried through the day (on both TV and Radio) so that when the speeches are made they can be reported upon as if nobody expected them. Government announcements come at weekends and on Bank Holidays. Government departments publish in-depth reports with “surprising” conclusions on various topics on Saturday morning.
Nobody should be surprised that genuine news does not reach the main BBC broadcasts throughout the day. I don’t know what the seemingly hundreds of people who sit at desks in the backdrop to the newsreader on the six o’clock news do with their time. But they certainly ain’t beavering away providing breaking news stories (like this one) with which Sophie Raworth can astonish her viewers.