I remember seeing this movie really late one night when I was a young kid, back around 2004, but the movie seemed like it was already older, so probably produced in the 80s. I saw it on TV, I think in color, definitely English. I don’t remember much about the plot other than these large lizards (they looked kind of like Komodo Dragons) that spit acid were terrorizing a small town. Two main characters were a male and female, presumably in a relationship. I remember that the movie ended with them lying together, defeated, in the middle of a grocery store on fire.