BBC News 24 launched just over a month after the BBC1 balloons, so once again I have to say 'where has the last 20 years gone?!'
Like most of the population, I had no access to the channel when it first began, so my first experience of News 24 was a couple of days after launch, when I recorded the overnight output from BBC1, just to see what it was like. I remember the presenter that night was Maxine Mawhinney, and was not yet simulcast with BBC World. It's perhaps ironic that it was at the time when the channel was actually doing its own thing 24 hours a day that the fewest number of people were able to view it.
The original flags branding is still by far my favourite, although I also still love the original version of the countdown from 1999, still better than all the subsequent umpteen remixes.
A516digital has a good summary of the last 20 years:
http://www.a516digital.com/2017/11/20-years-of-bbc-news-whenever-you-want.html - which states that the World simulcast started in March 1998. And in case anyone missed it, I recently posted up the early News 24 schedule here:
https://www.tvforum.co.uk/forums/post1076402#post-1076402