Could be this? MUST be this! Sensational work again, Euryale
I wish you'd been around then to answer the questions for some of these long-gone members. I copied the details of another Wednesday Play from Startrader only last week, during a post for actress Clare Jenkins, so I should have thought about that series as well.
I'm going through all the 'Can You Name This Film?' threads since 2002 (currently 72 pages) and am discovering all sorts of things - most successful contributors, unsolved queries and, of course, interesting memories and plotlines. All are worth reading again and I love seeing how they develop. This also applies to a 40-year-old mystery I had, finally solved (we think) by Simon Coward, who identified my 'burning car' memory as coming from TV series Conceptions of Murder. Unfortunately, I couldn't mark this as a Best Answer as I decided to start the thread in the 'British Television' section. That was my first post here.
I only know Hilda Barry from the otherwise obscure cast of Nathan and Tabileth. Sadly, it turns out that Albert van Dalsum and Nell Knoop both died the year after this was broadcast, and within six weeks of each other. There is a three-minute excerpt from the play, which does exist in it's entirety, at the page I've linked below. Just type 'nathan en tabileth' in the Search bar and you should see two references:
Levenlangtheater: Albert van Dalsum
I can't 'embed' the video clip here but CAN provide you with this still:
I've also found the 'Old age pensioners' acting together 40 years earlier:
In
The Chinese House,
17th November 1929. Photographer: Unknown
I am sure Euryale and others will be able to identify some of the other unsolved mysteries from the early threads in this section