I'm sure, certain(!) that Archie Fisher used to sing a song called "Hielan' Laddie", different from the one discussed so far. Part of it was,

"And when will ye come back again, bonnie laddie, hieland' laddie,
And when will ye come back again, my bonnie hielan' laddie?"

The tune IS similar to "Donkey Riding", which was recorded a couple of years ago by Canadian band, Great Big Sea.