[Kojak]

Nothing personal, but unfamiliar presenters like Lucy Hocking are going to drive UK viewers to other news channels.

Yes, because most viewers tune into BBC News based on who's presenting...  Or maybe they tune in because they want to catch the news and in reality most aren't really bothered who is presenting.  

I suspect outside of forums such as these the latter is usually the case.

Lucy's hardly unfamiliar anyway. She's been on loads of times when there's previously been combined output. And she used to regularly do The World Today that was seen on both channels at 5am. So she's been on UK screens a lot more than one might think.