A UK version would have the original score. With AIP, when the scores differ, the U.S. score is the alternate.
A few films AIP rescored for U.S. theatrical release at the time. Sometimes they would redub them also. Sometimes reedit. This is how we ended up with "the AIP version" and the "UK/international version".
Several European films were distributed in the U.S. with the original score. In the 1980s, when Orion/MGM/UA wanted to release them on VHS it was discovered that for most of them AIP had never secured the music rights. They began hunting down these composers throughout Europe. Some couldn't be found, some had died, and some wanted huge sums for the rights.
A single guy was hired to rescore these films. Just one guy with his keyboard synthesizer(sp?). That's how the films remain to this day on U.S. releases. Even BD. The best known example is WITCHFINDER GENERAL/CONQUEROR WORM. It had a beautiful original score that was replaced for VHS and cable distribution in the U.S. PAL>NTSC tapes of the UK version were a hot seller in the day. PAL>NTSC copies of the UK DVD were also popular until MGM released the UK version in the U.S. on DVD. MGM/UA licensed the UK version from whomever owned it. This is the cause of that particular Vincent Price Collection BD going OOP.
There is a documentary, including interview with composer who did the rescoring on PLANET OF THE VAMPIRES BD I believe now let's do upgrade Native 4K coming soon on kino 4k ultra hd release February 2021
A few films AIP rescored for U.S. theatrical release at the time. Sometimes they would redub them also. Sometimes reedit. This is how we ended up with "the AIP version" and the "UK/international version".
Several European films were distributed in the U.S. with the original score. In the 1980s, when Orion/MGM/UA wanted to release them on VHS it was discovered that for most of them AIP had never secured the music rights. They began hunting down these composers throughout Europe. Some couldn't be found, some had died, and some wanted huge sums for the rights.
A single guy was hired to rescore these films. Just one guy with his keyboard synthesizer(sp?). That's how the films remain to this day on U.S. releases. Even BD. The best known example is WITCHFINDER GENERAL/CONQUEROR WORM. It had a beautiful original score that was replaced for VHS and cable distribution in the U.S. PAL>NTSC tapes of the UK version were a hot seller in the day. PAL>NTSC copies of the UK DVD were also popular until MGM released the UK version in the U.S. on DVD. MGM/UA licensed the UK version from whomever owned it. This is the cause of that particular Vincent Price Collection BD going OOP.
There is a documentary, including interview with composer who did the rescoring on PLANET OF THE VAMPIRES BD I believe now let's do upgrade Native 4K coming soon on kino 4k ultra hd release February 2021