[DTV]

Except I ONLY heard this on the World Service bulletins, it WASN'T on the BBC website, I didn't see it or hear it anywhere else.  It's not a "single source", it's different products on different stations.  Something gets diluted when it gets watered down.  Tell me how you are not watering down the whole BBC News brand by requiring it to carry many different products that all need to do different things for different audiences.

What story is this exactly? What possible story is significant enough to get included in the short BBC World Service bulletins but not significant enough to get reported on any other BBC News programme or online?

You are right that something gets diluted when it gets watered down. In branding this is when you start adding too many other brands to your masterbrand and so your masterbrand gets drowned out - such as when people start referring to BBC News on the BBC World Service as simply the 'World Service' or BBC News 24 as 'News 24'. That is brand dilution as the core brand - BBC or BBC News - has been washed out.

BBC News does provide programming for different audiences that does different things. But when it does this, they are marketed as different things (e.g. BBC Newsnight, BBC Politics Live, etc.) to distinguish themselves from the standard BBC News brand which is used for straight news. When they are delivering straight news - regardless of whether it is a TV bulletin, TV rolling news, Radio bulletin, online article or on social media - it's packaged simply as BBC News as that is the product they are delivering - the news from the BBC. It's the same news provided by the same BBC News correspondents just on a different medium.