I think Dick may have something interesting here.

Dick - do these fishermen sing "Three Score and Ten" as sung by the Watersons, do they have a version perhaps that no-one has come across and which has been moulded by the tradition?

Do they sing "Shoals of Herring" from the Radio Ballad version or from some other version which has been moulded by the tradition?

And perhaps most important of all what other songs do they sing?

I mean clearly you have been out listening to these people sing and I seem to remember you saying it was the collectors duty to record everything the people sang. So apart from these two songs what else do they sing?

I am not suggesting you have been collecting but you must have heard them sing.