I linked to the wikipedia page on Jesus' Blood in my first post. I am assuming that the James Black composition was not mentioned then.

From what i can make out, the page was last edited in 2017, so i assume the James Black link was made sometime in 2017 or earlier.

I guess it is just a matter of checking the various edits made to the page since its creation in 2007 to see when James Black was mentioned.

I have also emailed the Gavin Bryars website about it.

Thanks for all the contributions to this thread.