There is some evidence to suggest that the BBC experimented with filming the output of the television monitor before the television service was placed on hiatus in 1939 - BBC executive Cecil Madden later recalled filming a production of The Scarlet Pimpernel in this way, only for film director Alexander Korda to order the burning of the negative as he owned the film rights to the book, which he felt had been infringed.
As was the usual method of BBC television drama production at the time, the play was produced in a multi-camera electronic studio on video cameras, although it was recorded as a 35 mm film telerecording rather than on videotape.