Finally got around to digging into the archive to see which TV broadcasts I have (and got a lovely surprise that 2 I was looking for I actually have and didn't even know! 😂 )
Anyway, here is the list:
Alien:
ABC US TV premiere 03-25-1984 WOC (same colour grading as Magnetic Video)
ABC US 01-21-1988 WOC (revised colour grading)
ITV UK TV 1984 WOC (air date unknown)
Aliens:
CBS broadcast version (KOIN CBS Portland, OR 03-14-1989) WOC
ITV WOC (air date unknown, but this is the version I was seeking, dubbed for language and featuring alternate soundtrack! It wasn't sponsored by Lilettes as the version I first saw, but is the exact same edit, so this is pre-1992)
Alien 3:
ITV (air date unknown, but it's early- suspect 1994ish) heavily edited and dubbed for language.
Predator:
UK TV WOC (air date unknown)
Predator 2:
ITV Movie Premiere UK (this is the version I was looking for (sponsored by Diet Coke) but interestingly, it doesn't have the 'technical difficulties' as I saw it as that night with the apologies in the mid movie news round, which means those problems were exclusive to the ITV tyne tees region)
The movies I have no air date for I can determine from the commercials/advert breaks and news broadcasts at beginning/end of recordings, I'll work those out later) 😊