It is peretty obscure, but I am hoping that somebody on theis side of the pond has also chanced upon it. I doubt that it ever travelled as far as the USA. I also think it unlikely that it will have reached anywhere searchable on the Internet. That is why I am asking Mudcatters - they have obscure and idiosyncratic connections.
I may at some time find a cassette with it still on, but even then I didn't get the first couple of lines on the tape.