"pardon" referred to a bag of utter gobbledegook which someone posted on this thread, and which has now thankfully been removed.

Nothing to do with Walter Pardon.

Cohen did a cracking doumentary on Peruvian musicians many years ago, but I can't remember him doing anything on Scots travellers. Are you perchance thinking of The Summer Walkers, Timothy Neat's film on Gaelic speaking travellers of the Scots highlands?