I remember seeing this version on TV as a child. https://www.youtube.com/watch?v=fpGThhWTW2E
This looks like a theatrical production (seeing that it comes from Columbia Pictures). There was a BBC TV version of the story, but it, for me, was difficult to watch, mainly because the production values were so cheap and basic, that I couldn’t get into it from a dramatic standpoint. The cheapness of everything was way too distracting. The Michael Radford film has a much different feel to it. I could actually get into the drama. Suffice it to say, I bought the Blu-Ray and in its restoration, the film looked a lot “newer”. Is the 1956 version your favorite version?