The old British BBFC 18 VHS was heavily censored. Several gore scenes were trimmed and even a plot sequence got cut out. But the good news is: all cuts were waived and the uncut version got an BBFC 15 rating as well. For nostalgics there's a detailed comparison between both versions with pictures available.
A former astronaut helps a government agent and a police detective track the source of mysterious alien pod spores, filled with lethal flesh-dissolving acid, to a South American coffee plantation controlled by alien pod clones.