There are undeniable similarities between "SF" and "FLW." "Cod Liver Oil" sounds rather less closely related.

Lloyd used a version of that tune for "Paddy and the Whale."

But couldn't MacColl have created the "FLW" tune on the basis of an authentic "SF" rather than the other way round?

In any case, the inability of anyone to connect Anderson to the ballad before its appearance in "Singing Island" is curious.