It was the BBC that didn't really anchor on location much, if at all. The first memory I've got is from, I think, 1999. Didn't the last day of the virtual era have some bulletins anchored from Edinburgh? I really don't recall as much on location presenting from the BBC as ITN - they seemed to pioneer it, really.
Yes, Martyn Lewis presented the Six from Edinburgh for his last bulletin, the day after the first elections to the Scottish Parliament.
As I say, the Beeb didn't really do much because there were separate departments within the Beeb who all had their own fiefdoms. As well as events there was also current affairs, responsible for programmes like Nationwide, Panorama and indeed the party conference coverage, while news were responsible for news bulletins (they were physically separate too, with news at TV Centre and current affairs at Lime Grove). So if the news was being anchored from the party conferences that would presumably tread on the toes of current affairs, so they didn't do it.