Yes, because the caption gen
Interesting, its documented here many times about the sync changes on the ITV network (particularly at 6am, 9:25am and 5:15pm on Fridays in London) causing VHS recorders to go crazy. Do the drops in and out to and from the the blue transmitter caption as seen on that video cause the same effect?
Yep, I can remember regional DTL interviews on Nationwide during the same now and again in the 70s. In fact something that sticks in my mind was a down the line interview with a bloke in Bristol, and another in Cardiff who started arguing with each other, and the director was cutting directly between the two studios with a nice splat everytime.
I thought NATLOCK was there to stop they happening? Although Cardiff was routed through Bristol so it would have been the Bristol director who was doing those cuts which may have complicated matters.
It was the 1970s, things that should have worked sometimes didn’t 😎 I suspect you’re right, Bristol were doing the cutting between themselves and Cardiff and that could have been the problem. Somewhere on You Tube is a recording of a Nationwide rehearsal where Manchester is feeding Leeds and themselves down the line, and I think there are splats there too. A virtual pint for whoever finds the video !