And I was oblivious to the changes, being a kid in the Granada region.
Never knew about TVS putting in a break bumper. Presumably they were the only ITV company to do this. I don't think Granada did, though it's a long time ago now for me to remember.
Yes, I'm not aware of any other company doing it ? They always had their own one too for ITV (as did Southern, and Meridian) Old habits and all that...
I don’t recall UTV having a break bumper until the 1990s either - however, they must have been in some use on ITV by 1989, because there was one in the 1989 generic package, LWT appears to have used it at any rate:
By 1995 Channel 4 had this one:
I don’t think it was their first though, because I remember one with a different effect that preceded it, in use from 1993.
I certainly don't remember any C4 break bumpers on TT, YTV, Granada, Central or Anglia (the channels I could regularly receive at the time).
On ITV, YTV used the 1989 generic break bumper for a while but abandoned it in 1990. Oddly, this coincided with TT introducing a very old-fashioned slit-scan bumper (which seemed to be a clip from an old PSA animation -- why they didn't use the ITV one they'll have been provided with is a mystery), which was replaced with a much nicer one a few months later and various animations were in use until YTV took over pres in 93.
YTV restarted bumpers in late 1996. I don't remember Granada or Central ever bothering until quite late on in 1997 or so; Anglia used theirs consistently from 1989 (presumably when the Panasonic cart machines went in?).