This is a good example of introducing local names into an older song.

From Wikipedia; Inglis Gundry notes in his introduction to Canow Kernow (published by the Federation of Old Cornwall Societies, 1966): '...the process of balladry still goes on. In the Logan Rock Inn at Treen a popular song called Way down Albert Square is gradually being transformed into a folk-song called Lamorna." And at the time of the publication of his seminal collection of songs and dances from Cornwall he did not consider the song sufficiently old or important enough to be included in his selection.

From Discogs;

Pasties and Cream; Brenda Wootton, John the Fish, Cornish Folk Sentinel Records, Newlyn, 1971 Their second LP; their first was released in 1968.
Lamorna, Traditional, sung by Pipers Folk; Great controversy over this song. In the version I know, the 'cab' is supposed to be Old Jorys jingle that ran from the First and Last in Penzance and Albert Square in St. Just 'away down to Lamorna'.

Our Friends The Yetties; Argo, 1971. Their fourth LP; their first was released in 1969.
Lamorna, Arranged By – Yetties Written By – Trad.