Jon,
All of the many versions I have of 'Coal Owner' derive from Lloyd.
Several of them give a bit more information.

It is said to have been written by William Hornsby, a collier of Shotton Moor, County Durham, during the great Durham Miners' Strike in 1844. Rediscovered by another miner J. S. Bell of Whiston, Lancashire in 1951 who presumably was Lloyd's source. Whether the original had attached the 'Derry Down' refrain or whether Lloyd added it I cannot say. What I do know is that in the early 19th century thousands of songs on broadsides and many by known authors were set to Derry Down, and quite rightly in my opinion. It's a great tune, and at least as old as the earliest print.