If TIOBE makes a splash this Autumn you might be interested in seeing the BBC "play for today" version. It should get a re run on the back of the new film if the BBC have got their eye on the ball. It has an all-English cast including one of the many McCann Brothers (they all look the same to me) and Joan Ploughright.
It's very low budget 70's Theatre drama (a bit like "Abigail