No, I've got the text and tune both already finished ("Glorkantas anĝeloj) in the hymnal Tero kaj ĉielo kantu, all I'm doing is putting the text into html in my online-hymnal's format, and sequencing a MIDI file based on the tune in the book. Listen to it when I'm done and tell me if it doesn't sound an awful lot like "B's Stream" ... yet the hymnal calls it "Portadown").
So I'm still wondering, whether perhaps British hymnals (the author of the text was William John Downes, who was an English Congregationalist and a University Professor in Hebrew and Old Testament at one of the British colleges (non-Oxbridge). He's one of the most important hymn-writers in Esperanto) call this tune "Portadown" even though it's nothing like the folk tune of that name.