The 1989 package brought some really good pres. There was loads of themed variants of the new ITV logo in trailers & promos. It proved to be a very adaptable logo.
In London both companies embraced it fully. At the time it was a bit of a shock to lose the individual branding especially LWT's. But looking back it was a great package and looked very slick and smart
On Thames it meant a long needed modernisation of their presentation, and it provided some cohesion between the two companies on air
The logo itself is fairly timeless and wasn't bettered by them until the current one was introduced. It wasn't that flexible, though the best adaptation of it was one Christmas when the triangle in the V was turned upside down and turned into a Christmas tree
They did use slightly different cuts of the music, though - LWT's would run beneath the announcement, and they were fond of using a still of the ident too. And, of course, Thames dropped it pretty much the week after the fateful franchise announcement.
I remember beginning an A-level media studies course in 1990 and one of our first tasks was to deconstruct the 1989 ident.