Sorry about the delay but I’ve been sick all week with the flu.
Anway here’s some more detail about both tapes.

Superman III - ITV (Thames) MAY-07-1990
http://imgur.com/a/kI6Q6
The 1990 broadcast is the better quality of the two but isnt complete. It’s missing 15 secs from the intro and 20 mins from the main film (from when the blind man loses his dog, until when clark kent arrives at the school reunion).

Superman III - ITV (HTV) SEP-05-1985
http://imgur.com/a/NGlM9
The 1985 broadcast is missing 45secs from the intro but the rest of the film is complete (with comercials). Quality wise it’s not as good as the 1990 brodcast.

Here are some unfiltered samples of both tapes.
1990 = https://mega.nz/#!31ZEyIqQ!0A8M3ey8T4I1EHyuqwCkkb5FRqBTAh_p8wx95pZKS_8
1985 = https://mega.nz/#!OopmiLpL!RVjs9m1TSYdk0MLLZhlnFqNFarRphIXuMSxDuZnj1OQ

Obviously they both need some work to bring the best out of them e.g. Avisynth filters, denoised, colour corrected, etc.
If anyone whats to help just let me know.