I remember a movie from the 1990s (definitely before 1999) which impressed me as a teenager but I have been unable to find. The movie concerns an invasion by extra dimensional aliens (I believe) which would open glowing tears in spacetime, attempting to enter “our” universe. The protagonists were a British military unit and a woman (potentially American) who was the civilian expert. I can’t remember a great deal more. It was certainly a B-movie and rather dark in tone — not particularly epic or heroic as many other films in the genre.  I can’t recall if the film was produced by Sci Fi channel itself or not. It’s very possible that it was filmed in the United Kingdom. Anyway, does this ring any bells for anyone?