Robin Hall and Jimmie definately did it and I can remember the chorus a wee bit different to your's Cranky

"There is a monster in Loch Ness, A fact ye cannie hide,
It's got mair curves than a movie star,
An a wiggle three miles wide
An a wiggle three miles wide"

Iv'e just found their Scottish Choice album and it's not on that!
The search continues