I'm afraid I can't help, but if it might whittle things down, I'm guessing it's a US library that had these cues recorded in England by session musicians there. The music cues here, especially the "animals" one have a bit of an English session group feel regarding the overall "sound".
PL here does have a friend, though, who worked in broadcasting in the mid-late '80s and held on to a ton of tape-reel only library material from back in the day ("Background Cues #1" from WinWalt Productions/Helene Matalon being from his collection). Wonder if that person might know a thing or two about this library.