[DTV]

Actually telling the truth wouldn't play so well, would it:
"We're renaming BBC World News and broadcasting it in the UK, with a few domestic scraps and simulcasts thrown in as opt outs, to make you think you haven't lost a channel or many of the popular presenters"

Given we've just spent four weeks with effectively the BBC News channel being broadcast internationally for large parts of the day, you could equally presuppose that World's presenters are being kept on to help make the international audience think they haven't lost a channel.