Speaking of other versions, Lanfair, I worked with a climber in the 60's who gave the words:

As I was a climbimg on the the grey slopes of Cloggy
As I was a climbimg on Cloggy one day
I met a young climber clothed all in white linen
Clothed all in white linen and colder than clay

etc

I gues Cloggy is Clogwyn something in Snowdonia