Another channel 4 ad break breakdown, this one is from 1984. Given there is an advert for Youngers Scotch Bitter, I'd suggest it's from either Border, Tyne Tees, Granada, or possibly Yorkshire.
I have a feeling that’s YTV, but it could easily be any of the northern stations, like you say.
I notice there are points in that footage where the region opts back to the Channel 4 feed in vision only. That reminds me of an afternoon in late 1984, when Channel 4 in the Tyne Tees region opted out to show their commercials but only the audio from the commercials was heard. The Channel 4 “follows shortly” slides remained on screen throughout the breaks while we heard the various ads. This went on from about 2.30 until around 5pm, when partway through a break the screen went from the C4 slide to some kind of static/moving lines and then the ads appeared in vision shortly afterwards.
I’ve no idea what had gone wrong - evidently the stations could opt out in sound only (and perhaps vision only), not that I think they’d ever do so intentionally (though UTV notably faded the music up a few seconds after they rejoined the C4 caption during partly filled breaks, so they seemed to have equipment that was capable of more than just down and up fade through black when opting in and out). The opts were supposed to be automated, but for whatever reason several regions seemed to do them manually at least part of the time.
Cut out the coupon in your TV Times!