Just to muddy the waters further: I've just searched the forum and DT, and couldn't find a mention of the tune in connection with W. Gordon Smith. However, on the first album by the long-gone Scottish band The Islanders, there is a set of lyrics to the tune written by Smith. It goes:

THE DARK ISLAND
(music, Ian Maclachlan / Words, Gordon Smith)

Chorus:
Come again, come again, sings the sandpiper's song
Come back to the island where you belong
And the isle that is home wherever you stray
Will blossom its flowers in welcome one day

The tide's on the turn and the boat must away
And your sad eyes reveal what the heart cannot say
Every step to the quay is a mile of the way
From the island that can't stop you leaving today

Oh load up the boat and we'll cast her away
See the waves show their teeth on the rocks in the bay
Turn your back on the hills, turn your face to the sea
Turn away from the island you're leaving today

Oh the water is deep, watch the waves turn to grey
And the islands astern, a lifetime away
You can turn to the hills, you can just see the way
Turn and smile to the island you're leaving today



No further info. Just thought I'd throw it in ...