Well it looks like we were right to finger David Hammond. I've just found a little collection he published called "Songs of Belfast" published by Gilert Dalton (Dublin) in 1978. He has "Belfast" instead of "Irish" and also changes "steady drip" to "drip, drip, drip."

Calvert's idiosyncratic punctuation and dialectic spelling is tidied up, and in at least one instance replaced with Hammond's. (From which I assume that he didn't have a printed copy to work from.) He gives no copyright credit or acknowledgement but does give Calvert as the author.