Ambiguous notes in the DT strike again, it seems. Although they imply that the text and tune are Mr Pottipher's, they aren't. I have no idea where the tune as given there may have come from. Probably it was transcribed from someone's memory, and derives previously from one of the many revival recordings of the song. Once transposed it's actually very close in terms of note-pitches, though the phrasing is rather different and some decoration has been added.