I have a feeling that the programme may have been written and presented by Nigel Calder, former editor of the New Scientist. I'm having no luck tracking down th

I have a feeling that the programme may have been written and presented by Nigel Calder, former editor of the New Scientist. I'm having no luck tracking down the documentary itself, though. The title might be "The Key To The Universe", for which I've seen a couple of reviews that are consistent with the show I remember. He seems to have published a book of the same title. The show was screened in 1977, possibly twice, and the show is indeed two hours long. I have a review here that says: "Level: popular science, but viewers without some knowledge of high-energy physics would be handicapped". That sounds about right (when I saw it, my knowledge of high-energy physics was roughly zero, and it's not much better now).