BR
I do remember being aware of the 1991 rebrand of BBC1 and BBC2, but probably noticed title sequences more than channel branding back in those days as often if they were changed they really would change them, rather than just make slight tweaks or polish them up. Branding wise being in a location which could get three ITV regions and S4C I was certainly aware of how different ITV regions were, and how most were not a patch on Central.
I think though it was sports broadcasting where I noticed it more, notably the 1992 Olympics (that "Barcelona" intro!), and then in the following years things got a bit more interesting than simple text on the screen. The Big Breakfast's evolution over 1996-1998 especially were examples of revamps done badly and done well, but news wise it probably wasn't until 1999 when C4, Newsnight, ITN/ITV News and the BBC all revamped within six months of each other that that grabbed my attention - although Central News had always had interesting revamps throughout the 90s - pretty much always revolution rather than evolution.
I think though it was sports broadcasting where I noticed it more, notably the 1992 Olympics (that "Barcelona" intro!), and then in the following years things got a bit more interesting than simple text on the screen. The Big Breakfast's evolution over 1996-1998 especially were examples of revamps done badly and done well, but news wise it probably wasn't until 1999 when C4, Newsnight, ITN/ITV News and the BBC all revamped within six months of each other that that grabbed my attention - although Central News had always had interesting revamps throughout the 90s - pretty much always revolution rather than evolution.