I was just Googling to get the words, then remembered Mudcat. Fascinating the differences between how I hear it, how others hear it, how it's written here. Some parts make more sense now.
So now I know it is "up harbour" instead of "on over". "spar" not "spark".
Other versions I found just now, "Summer's sheen" (some machine), Walker shore (walk ashore), "Never would read" (never worried),

--Longest Johns; Mary Black. What June Tabor has is pretty much the same as what is here.