[Neil Jones]

Almost certainly upscaled I'd have thought, unless a fresh tape has been found from somewhere with a very pristine recording... Tapes do turn up in strange places sometimes (as the Dr Who recoveries will tell you) but even then why would one have that on it?

Artificial AI/Upscaling can generate good results but I feel you need to monitor it/intervene sometimes otherwise you end up with something that looks worse than what you started with.

Don't think there were any channels that did their idents on film? As above, what would be the point?