The radio play version of this I think was the original episode … this is the film version:

“Send for Paul Temple (1946) is a British “quota quickie” mystery, directed by John Argyle and featuring Anthony Hulme as the famous radio sleuth. It is generally reviewed as a charming, fast-paced “B-movie” that effectively brings the Francis Durbridge radio character to the screen, focusing on a, “Green Finger” diamond heist plot.”