Martin: I've just had another read of the letter that Tim D. enclosed with his CD. In he said,

"There are a couple of errors [in the sleeve notes], including, strangely, the dates for John Keegan Casey". Wish I had noticed that earlier.

Since Casey also wrote "Máire My Girl", I wonder if this song could also have been inspired by Mary Hanley, since "Máire" is of course Irish for Mary? Is this song in the book that you have? If so, any clues as to its origins?