I studied a film script in college called "Torture Island Barn Dance" and it was the exact same story as this! Another strange thing about it was the fact that it was written before this pic was made. Spooky.
Nothing exists more beautifully than nothing.
"Night of the Big Heat" was a science fiction novel by John Lymington, published in 1959. In this, the story is substantially the same, although 'Hanson' is called 'Harson' in the original. Hammer sexed it up quite a bit for their followers. The first screen version of NOTBH was a television play, the 'ITV Play of the Week' version, broadcast in 1960. This was superior to the film because it relied on suggestion and suspense, rather than the rather poor special effects of the film version. In Lymington's original, the creatures were giant, transparent spiders that electrocuted their victims. This was changed for the Teleplay, and they were described as giant maggots, although they apparently metamorphosed (unseen) into giant arthropods. At one point, an insectile arm was seen coming round a door and the hero was able to push the door against the arm and eject the creature before it could get in. As in the book, the story ended when the heat caused fires and the creatures were revealed to vulnerable to fire, and perished in the blaze. This was, of course, the opposite of the film. Another major difference between the book and the film was that in the book, the 'Big Heat' was all over the earth, not just on the island, although the invasion was apparently centred on the island.
As SF, neither the novel nor the two screen versions are up there with Azimov, Clarke, or any of the other 1950s greats. The idea is mediocre and not particularly well executed. The novel was, however, fairly unusual in that it dealt with a relationship triangle, of the novelist, his wife and an obsessive woman stalker and her failed attempt at seducing him 'The Big Heat' could, therefore, serve as a metaphor, but a clumsy one, at best.