"The Irish Ballad" that Laoise copied has one more unofficial verse:

The following verse is inserted between the "And when at last the police came by" verse and the "My tragic tale I won't prolong" verse. Tom has confirmed that he did NOT write this verse, so its origin is unknown.
And just one thing before I go
Sing rickety tickety tin
And just one thing before I go
There's something I think that you ought to know
They had no proof, so they let her go
And they say that she's tall and thin, and thin
They say that she's tall and thin.

I copied this shamelessly from the best Tom Lehrer website I know