Coming to this thread fifteen years on, it does of course occur that maybe Liz the Squeak has taken up some other avenue instead, and possibly got so fed up waiting for a definitive answer that she gave up entirely. I hope not.

John Faulkner (Critics Group, Combine, Reel Union, etc)., used to sing 'Nancy of London' back in the 60s and 70s. Might still sing it, even though he decamped to Galway many decades ago.

...the fair inland stream... made a lot more sense than the 'street', too. What's an inland street?

Anyway, try this link for a fairly comprehensive essay on this and other versions:

https://mainlynorfolk.info/peter.bellamy/songs/prettynancyofyarmouth.html

Can't find any recordings of the song, which is a shame, as Faulkner made it into a classic (rather than just a sort of singalong folk song).

Still, maybe after All These Years someone will shed more light on it!

Cheers.

A.