As far as the ITV version, the problem is that I don't have it, and I haven't seen the whole thing.
And actually, the matter of the binary sunset *is* settled, and it's been discussed at length in other threads. We know what it's supposed to look like. Harmy has seen frames from an unfaded Technicolor print, and Mike Verta has seen a Technicolor print projected on 70s equipment.
This is what it looks like in the latest workprint of Harmy's Despecialized Edition 2.0:
Puggo Grande transfer:
Catnap bootleg:
With the old 80s transfers, when I'm color-correcting pictures I have to do it differently for each scene. It's possible to make them look more like the original colors, but I find that if I take the corrections I applied to one image and try them on another one, it doesn't come out right. And as some of the color information from the film got lost in the transfer to video, even if I can make the colors look closer, some of them are just not there (like the blue you talked about from that Derann image).
FYI, here's what I did to the sunset image you posted:
