There's a song, musically related only, called "The coal-owner and the pitman's wife," which has the line "Derry down, down, down derry down" at the end of each stanza. A.L. Lloyd writes in his Folk Song in England: "Seemingly it was made at the time of the 1844 Durham strike by a collier, William Hornsby of Shotton Moor.[...] in using a classical ballad form, the pitman-songmaker was not inspired by a romantic wish to revive the beauties of past folk song. In fact, no doubt involuntarily, his ballad emerges rather as a witty caricature of the lyric of former times. The tune belongs to the great family of 'Henry Martin' and a score of ballads with 'derrydown' refrain." (Paladin edition, p. 323) The song is HERE (Union Songs), with score & midi.