At last we have JC's examples of the prime of English folksong that couldn't possibly have been written by a broadside writer, or have come from any commercial enterprise. We now have something to work on.

I'll start with Joseph Taylor's unique fragment known as 'Brigg Fair'.
Unique means no variation within the oral tradition. Well that's one descriptor out then. Need we dwell on this one? Beautiful tune but hardly a prime example.

Maids of Australia. Again hardly a widespread song in oral tradition. Could that be because there are so few broadsides of it?
***'there is no real gap in standard or skill between a song like Maid of Australia and a typical broadside verse'***. Must agree with this, Rigby.