No, guys, it wasn't a version of a known song! I would have recognised any of those. I don't think this even WAS a song at all - it wasn't metrical enough. Hazy recollections lead me to believe it (at least the opening part) was based on a Gaelic air, which are often quite free in rhythm - and whatever it is the announcer said when introducing it reinforced this impression. So I don't think song titles are going to unearth it because it wasn't that sort of music. It's probably locked away in perfect digital clarity somewhere in my subconscious memory-vaults, just tantalisingly out of reach.

The other thing is, I think this was some very old track from an early recording. It was broadcast on BBC Radio 3, and they often used to play specialist things like that. I have a feeling it was from the 78-RPM era.