Oh wow, a rare example where the Technidisc/GOUT source has the dirtier splice. I think that may be the biggest glob of cement I've seen thus far.

Another thing I've been thinking about: The weird liquid damage on reel 3 of the JSC source. The ITV version seems to be missing it, as does the 1991 UK widescreen VHS. The ITV version could have come from a source that was made off the IP before whatever it was got spilled on it. Whether it was 35mm or 16mm, I'd think there would be a cropped flat master of the entire film that would have already existed, and maybe it predated whatever happened?

The 1991 VHS is another matter. Due to the NTSC-to-PAL conversion and shrinking ratio, I am now convinced it is just a straight standards conversion of the original U.S. SWE master. I checked against the two examples of rounded corners you posted earlier in the thread, and those corners show up on the '91 UK VHS too.

Do you have a full preservation of the "ISR" SWE? It seems to have been shrugged off for years, under the assumption that it's redundant/inferior to the JSC. But now that it's clear it's not a straight port of the JSC transfer, it really needs to be compared against the JSC in full.