My memory is the Lottery Update was in the first break after the draw and then the bulletin was usually just before 9pm - the BBC also tended to air their news as close to 9pm as possible.   I think it was the same on Sundays until Corrie came along and the 7.30/8/9 fixed start time became a thing.
I don't think they ever integrated the weekend regional news, even when the did in the week.  Up until the last couple of years the regional news usually aired first, though when ITN did a full classified results service the regional news and "Goals Extra" in some regions would follow the national bulletin.   I guess that changed around 2001 when ITV Sport briefly had The Goal Rush for the scores then the news followed.
	
 
Goals Extra began on Granada and Central in 1991/92, of course that season they still had rights to the top flight. They carried it on after they lost the rights, Granada were still doing it circa 1996. The other regions would have had very heavy football content in the regional news in those days as well, the Saturday teatime regional bulletins on both channels were pretty much 90% sport.
The Goal Rush began on ITV2 in 1998. It was a Meridian production, and for a few months in 2000, it started being simulcast on Meridian, Anglia and HTV - but as the teatime news was on at 4.45 in those days it meant it had to stop on those channels before the final whistles, which was a bit pointless. There was also a period around the turn of the century where Gabby Logan was on the teatime news for a full sports bulletin. There wouldn't be any regional news in the late news.
The usual ITV Saturday night line-up in the autumn circa the mid-nineties would be 5.20 Baywatch, 6.15 Gladiators, 7.15 Blind Date, 8.15 Family Fortunes (which would be opposite Casualty when it was the biggest show on TV, so Family Fortunes was a useful way to fill the slot without chucking away any big shows), 8.45 News, and then a big film or entertainment special at nine. Whereas this would be your BBC1 schedule - 
https://genome.ch.bbc.co.uk/schedules/bbcone/london/1995-11-25#at-17.35 - with the Gen Game, House Party, the lottery and Casualty before the news at 8.55 and usually a crap TV movie.
But as I say, there were occasions when ITV would do the news opposite the lottery around 8pm, as it was a pretty thankless slot and allowed them to line up with all the BBC1 junctions. I've got a few Radio Times from the summer of 1996 when they do this, with You Bet at 6.55, the news at 7.55 and The Big Big Talent Show at 8.10.
There was also a period circa 2000 when if the Beeb wanted to show a long film or programme that would make the news particularly late, there would be two news bulletins on an evening, like this - 
https://genome.ch.bbc.co.uk/schedules/bbcone/london/1999-11-14#at-19.50