That's great, Dave. Thanks: question answered. I sort of guessed there could be a Sheffield Ramblers connection. I recorded Bernard, Albert's brother singing it at a Ramblers' singsong at the Brown Cow in the Wicker in May 1970. They also mentioned, but unfortunately didn't sing, another "Swaledale" song, which they called "Extension", including the line "the extension of Swaledale is thirty long miles" or something like that.Ring any bells?