I looked up, I think, all the films based on the plays at once, so, heh, I don't remember which ones were available re. marketplace and which not, but noted all the same. :-)

You can find it here as part of the Rattigan Collection we were both snagging from before. Looking at the plot for the film, that does sound very much reworked, indeed, it's only just recognisable as being related to what I listened to the other week. It was a 1965 version, so the sound isn't as clear as some.