Steve Gardham wrote: However, we also have Tarrington in Herefordshire. Orton's other songs are also broadside ballads and well-known.

I just assumed that was an error of memory for Tarrington.

If you've looked at Orton's other songs, can you assess his memory? That is, if he's working from broadsides, can you tell how far he has strayed from them? That might be revealing. (I realize you might not be able to identify his exact source, but it would still be indicative.)