[Stooky Bill]

I remember being amused by a TM promo shown on Tyne Tees in the early-mid 90s (probably 1993 after the takeover by YTV and when anything that could go wrong did go wrong). It was probably about 10am, and after R&J trailed the programme, pres didn’t cut away and we saw Richard pick up a polystyrene cup from out of shot and put it back on the table in front of him, and a runner (literally) run up to Judy with some paperwork and Judy saying “Just leave it on the desk, please, Rhona/Rhoda”. It was a good 10-15 seconds before this faded out - probably a raw feed going out to network until Granada switched circuit for TTTP or whatever was following. It amused me, anyway!

Granada also had the facility to opt-out of TM locally whilst still feeding it to everyone else (probably no different to inserting their own ads whilst leaving the studio on the outgoing feed,

That's just basic networking in those days. What the ITV company sent down the line to the others and what came out of their TX suite to their viewers were two different things. As you say it's like them playing adverts, or how if it was a Thames programme the rest of the country didn't hear the Thames announcer over the credits

So if This Morning did something local it's just a case of Granada TX staying with the studio and everyone else doing their own thing

I wasn’t aware of that side-by-side facility on YouTube. It’s potentially very useful, but can you play both videos at the same time? When I click to play the second video, the first one stops - and vice versa.

It's not on YouTube, it's a different site. Have you tried pressing the play button underneath the two videos?