A couple friends of mine have offered to procure me the BD of Superman 3. In the meantime, I’ve done an analysis using a rip, so I’ve only got the theatrical to work with - that should change soon.
There are a LOT of small additions to the Yorkshire airing. There’s also one cut, as well as the closing credits being trimmed so they only start with the cast. Also, one addition has a bumper (as for a cut to commercial) right in the middle of it.
Given further source, and once I’ve procured the actual BD, I should be able to synch everything up and try to put something together.
A curiosity: do any of the extant TV rips have the opening bumper intact, and which one? I remember seeing Superman 2 on TV in the theatrical cut and the WB logo was the same one as on the RIC, but I didn’t catch such for Superman 3, and I know the BDs for Superman 2, 3 and 4 are all plastered with the current logo. (Obviously Superman 2 is also plastered on the RIC and the TV master I saw, as the Shield of Staleness didn’t show up until several years after the movie came out!)