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This only changed when frontcaps were discontinued in 1988, when they started using a still Tyne Tees slide to introduce programmes, though not always with an announcement. I guess they thought it looked neater, or it was easier, to cross-fade into the opening titles rather than fading in after the frontcap (that was often still present, just not broadcast). Slowly announcements became more commonplace as they moved away (again slowly) from IVC - although this wasn't dropped totally until 1996.
Tyne Tees did continue to start programmes after a trailer post-1988, often without a static ident either. They also went through a phase in 1990 where in prime-time (when they were experimenting with no IVC between 7 and 10pm) they'd cross-fade a trailer to a menu of the night's programmes, then switch to a still of the ident which was left to cross-fade into the programme without the announcer introducing the programme.
They also burned in the station ident into regional programmes up until around July 1992, and these were usually joined right after a break or trailer. It was only in 1993, when transmission moved to Leeds and all IVC was done whilst YTV played out an ident, that all programmes started being introduced with an announcement -- up until 1992 it was 50/50.
The use of the static slide used to depend on the on-duty controller. The control desk had basic automation (which allowed easy screen-wipes, cross-fades, fast fade-through-black etc) but this introduced sound glitches. It was also possible to do this manually (which was glitch-free) but it seemed that some controllers preferred the automation and others didn't bother with it.
Generally, if the automated system was in use, the static ident would appear. If not, it only appeared sometimes.
The point being, though, that announcerless intros into programmes were very common. Even after 1993 it wasn't unusual for Kathy Secker in particular (at this point the announcer self-opped some parts of presentation from Newcastle) to play out a clean ident in lieu of an announcement, although this was usually animated.
I get the impression that this would have continued had TTTV remained independent -- several of the junctions on New Year's Eve 1992 (the last day of true TTTV presentation) with Lyn Spencer (I have the tape somewhere) went straight from trailer to programme without ident of any nature.
As an aside, I do not believe there was a conscious effort to phase out IVC. Between Feb and Dec 1990 there was no IVC in prime-time at all, but this stopped around Christmas of that year and TTTV beefed IVC back up to 1988 levels at that point (sometimes with IVC before and after the break). But it all came to a juddering halt in 1993 -- first there were three IVC segments per night in early 1993 (each lasting 45 seconds -- one trailer plus one ident on YTV), and then when transmission was moved, pretty much every other junction had IVC of 10-15 seconds before programmes when YTV were playing an ident. If YTV played a short ident, TTTV would usually go with a static but Bill would often do a 4 or 5 second IVC just for the sake of it it would seem.