The One, Six, Nine and daytime summaries all relaunched on the same day with the new look on the 10th May 1999. I wager they were promoting the Six Because the change to that bulletin was the most significant.
That's right, because that was the first bulletin with regional headlines and with its 'family' of reporters and with stronger links to the regional news. But all the bulletins changed on the same day so the new titles and theme would have first appeared on the daytime summaries.
A few weeks earlier, when ITV News had their revamp, again the teatime news was the bulletin with the biggest changes, and the new titles and theme launched on the teatime bulletin, with all the previous bulletins that day, including the lunchtime news, keeping the old look.
Would anyone happen to know where I might find the clip of Sophie Raworth taking over mid bulletin due to Anna Ford losing her voice.
With "Geoff HOOOON!". I remember a few days later on Johnny Vaughan Tonight, Vaughan pretended to fall ill at the end of the programme, and Sophie Raworth ran in to say goodnight.
As mentioned, there wouldn't be a specific backup presenter but there would probably always be someone in the building called a presenter. One famous example was when Jan Leeming got mugged in TV Centre in 1987 just before the news, I know Christopher Morris (the old reporter as seen on the 1979 Election repeat, not the current reporter or indeed from The Day Today) stood in at the last minute, presumably he was there to voice a report.
I do remember reading that when Nicholas Witchell fell in one day in the late eighties, Richard Whitmore was in the building doing the daytime summaries and volunteered to do the Six O'Clock News. But they got Andrew Harvey in from home instead.