USA dvd release, with some PAL specs
VCI just released the movie on dvd... Unfortunately VCI typically uses a PAL digital source of foreign films (instead of the film itself) and interlaces it for NTSC. This keeps the sped-up PAL audio and shorter runtime. Having just got the dvd, that seems to be the case here. The 99 minute runtime is the same as the PAL dvd. Actor Jeremy Kemp's voice is noticeably high-pitched.
IMDB states the USA runtime as 88 minutes. Either a mistake, or the film was edited for USA release.