Brian Sibley has an account with Soundcloud and has posted some of his BBC work there.
For the centenary he presented a documentary on the BBC World Service. He has uploaded it to his Soundcloud from where it can be streamed.
I use the Firefox web browser. You can get an add-on titled Video Download Helper (VDH) for Firefox. It captures audio as well as video. I mention this as you might want a local copy of the documentary. I was able to capture a mp3 of the documentary with VDH.
For the centenary he presented a documentary on the BBC World Service. He has uploaded it to his Soundcloud from where it can be streamed.
Radio documentary feature, written and presented by BRIAN SIBLEY, about the crimes of 'Jack the Ripper', first broadcast on the BBC Wold Service in 1988. Contributors: Martin Fido, Melvin Harris, Helena Kennedy QC, Jeffrey Richards, Donald Rumbellow and Bill Waddell. Produced by Adrian Washbourne.