Gaslight

The later version is Hollywood English, which I sometimes think is a downtown section of Hollywood Transylvanian. Believe me, the original is the real thing, from the small details up to the social assumptions: it's recognisably English. As such, the thriller is grounded in a reality that the later version can never have. And so it's scary! Of course, I admit that this justification of the original might be a lot less convincing if you're reading my words on the other side of the world...

As for the difficulty of getting hold of a copy, well every few years it's shown on one TV station or another over here, so there has to be a good copy somewhere out there.